| Opera's slave princess | 26 |
| Opera's Varnay et al. | 25 |
| Opera's ___ Te Kanawa | 25 |
| Opera, ballet and so on | 23 |
| Opera, with "La" | 26 |
| Opera-house accommodation | 25 |
| Operagoer's accessory | 25 |
| Operagoer's wear, maybe | 27 |
| Operate a rummage sale | 22 |
| Operate like French doors | 25 |
| Operate stealthily, as a sub | 28 |
| Operated using a light beam | 27 |
| Operated, as machinery | 22 |
| Operates, as a hand organ | 25 |
| Operates, as machinery | 22 |
| Operatic African slave | 22 |
| Operatic and dramatic villain | 29 |
| Operatic barber et al. | 22 |
| Operatic baritone Antonio | 25 |
| Operatic basso Enzo _____ | 25 |
| Operatic composer Montemezzi | 28 |
| Operatic crowd-pleaser | 22 |
| Operatic encore choice | 22 |
| Operatic high priestess | 23 |
| Operatic love scene, usually | 28 |
| Operatic masterpiece of 1871 | 28 |
| Operatic melodies for one | 25 |
| Operatic movement circa 1900 | 28 |
| Operatic offering by Gounod | 27 |
| Operatic offering by Puccini | 28 |
| Operatic offering by Verdi | 26 |
| Operatic offering by Wagner | 27 |
| Operatic performance for one | 28 |
| Operatic play-within-a-play | 27 |
| Operatic singer on a sofa? | 26 |
| Operatic singing style | 22 |
| Operatic solo andrecitative | 28 |
| Operatic soprano from N.Y.C. | 28 |
| Operatic soprano Geraldine | 26 |
| Operatic soprano Gluck | 22 |
| Operatic soprano Marilyn | 24 |
| Operatic soprano Netrebko | 25 |
| Operatic tenor Vickers | 22 |
| Operatic tenor ___ Alagna | 25 |
| Operatic tour de force | 22 |
| Operatic Trojan princess | 24 |
| Operatic villains, often | 24 |
| Operating at peak capacity | 26 |
| Operating automatically | 23 |
| Operating procedures (abbr.) | 28 |
| Operating procedures: Abbr. | 27 |
| Operating room apparel | 22 |
| Operating room assistant | 24 |
| Operating room devices | 22 |
| Operating room necessities | 26 |
| Operating room number? | 22 |
| Operating room request | 22 |
| Operating simultaneously | 24 |
| Operating system choice | 23 |
| Operating system for PCs | 24 |
| Operating system option | 23 |
| Operating system since 1969 | 27 |
| Operating system, abbr. | 23 |
| Operating with efficiency | 25 |
| Operating without _____ | 23 |
| Operating-room process | 22 |
| Operation Allied Force gp. | 26 |
| Operation at the Alamo | 22 |
| Operation by an obstetrician | 28 |
| Operation Cyclone org. | 22 |
| Operation Desert Fox, e.g. | 26 |
| Operation Desert Storm | 22 |
| Operation Desert Storm target | 29 |
| Operation Enduring Care gp. | 27 |
| Operation Exodus participant | 28 |
| Operation Hastings org. | 23 |
| Operation IceBridge grp. | 24 |
| Operation in 1998 news | 22 |
| Operation Just Cause target | 27 |
| Operation Mail Call gp. | 23 |
| Operation Mail Call grp. | 24 |
| Operation Neptune Spear org. | 28 |
| Operation Overlord beach | 24 |
| Operation Overlord high point | 29 |
| Operation Overlord launch | 25 |
| Operation Overlord monogram | 27 |
| Operation Overlord overseer | 27 |
| Operation Overlord site | 23 |
| Operation Overlord time | 23 |
| Operation Overlord's time | 29 |
| Operation Overlord, e.g. | 24 |
| Operation Phone Home gp. | 24 |
| Operation Pipe Dreams org. | 26 |
| Operation Red Dawn city | 23 |
| Operation Redwing event, 1956 | 29 |
| Operation since August 1990 | 27 |
| Operation Solomon airline | 25 |
| Operation Trinity event | 23 |
| Operation Trinity locale | 24 |
| Operation ___ Freedom (2003) | 28 |