| Radioactive Blondie song? | 25 |
| Radioactive decay emission | 26 |
| Radioactive decay measure | 25 |
| Radioactive decay stream | 24 |
| Radioactive element, at times | 29 |
| Radioactivity pioneer Curie | 27 |
| Radioactivity researcher | 24 |
| Radiodensity indicators | 23 |
| Radiographs, familiarly | 23 |
| Radiohead "All ___" | 29 |
| Radiohead "Cut ___" | 29 |
| Radiohead "In ___" | 28 |
| Radiohead "No ___" | 28 |
| Radiohead album of 2000 | 23 |
| Radiohead album of 2001 | 23 |
| Radiohead frontman Thom | 23 |
| Radiohead frontman Yorke | 24 |
| Radiohead lead singer Yorke | 27 |
| Radiohead producer Godrich | 26 |
| Radiohead record label | 22 |
| Radiological scan, for short | 28 |
| Radiologist's concern | 25 |
| Radiologist's item | 22 |
| Radiologist's photo | 23 |
| Radiology pioneer Curie | 23 |
| Radiology staple, for short | 27 |
| Radioman's nickname | 23 |
| Radios for good buddies? | 24 |
| Radiotelegraphy code inventor | 29 |
| Radiotelephony response | 23 |
| Radish or carrot, e.g. | 22 |
| Radium co-discoverer Marie | 26 |
| Radius and ulna, for example | 28 |
| Radius squared times pi | 23 |
| Radius starting point: Abbr. | 28 |
| Radius' comrade-in-arms? | 28 |
| Radius's companion | 22 |
| Radius's comrade-in-arms? | 29 |
| Radius's counterpart | 24 |
| Radius, but not diameter | 24 |
| Radiuses' counterparts | 26 |
| Radiuses' partners | 22 |
| Radner of "SNL" | 25 |
| Radon or radium: Abbr. | 22 |
| Raekwon "100 ___" | 27 |
| RAF award for gallantry | 23 |
| RAF awards for gallantry | 24 |
| Rafael Nadal specialty | 22 |
| Rafael Nadal's game | 23 |
| Rafael Palmeiro, for one | 24 |
| Rafer Johnson's forte | 25 |
| Raffle winners get them | 23 |
| Rafsanjani and Bani-Sadr | 24 |
| Rafsanjani's country | 24 |
| Raft material, perhaps | 22 |
| Raft, or place for a raft | 25 |
| Rafter who got too much sun? | 28 |
| Rafter's protection | 23 |
| Rag cheats readership? | 22 |
| Ragamuffin or Maine Coon | 24 |
| Ragamuffin's attire | 23 |
| Ragamuffin's delight | 24 |
| Ragazza's grandmother | 25 |
| Ragazzo's grandfather | 25 |
| Rage inducer, slangily | 22 |
| Ragged Dick's creator | 25 |
| Ragged edges, in metalworking | 29 |
| Raggedy Ann and Barbie | 22 |
| Raggedy Ann and others | 22 |
| Raggedy Ann and Raggedy Andy | 28 |
| Raggedy Ann's friend | 24 |
| Raggedy Ann's hair | 22 |
| Raggedy one's brother | 25 |
| Raggedy role for Audrey | 23 |
| Ragout of roasted game | 22 |
| Rags-to-riches author Horatio | 29 |
| Rags-to-riches heroine | 22 |
| Rags-to-riches Horatio | 22 |
| Rags-to-riches writer Alger | 27 |
| Ragtime composer Blake | 22 |
| Rai ___ (Italian TV channel) | 28 |
| Raid a Southern garden? | 23 |
| Raid on Entebbe weapons | 26 |
| Raid the arsenal early | 22 |
| Raider successes: Abbr. | 23 |
| Raider's pick: Abbr. | 24 |
| Raiders Hall-of-Famer Jim | 25 |
| Raiders make them, informally | 29 |
| Raiders of the Old West | 23 |
| Raiders quarterback Derek | 25 |
| Raiders' successes | 22 |
| Raids at the Colossus? | 22 |
| Raids made during hog wars? | 27 |
| Raids the refrigerator | 22 |
| Rail beside a staircase | 23 |
| Rail campaign, traditionally | 28 |
| Rail chemical carriers | 22 |
| Rail commuters' oases | 25 |
| Rail option, to Rodrigo | 23 |
| Rail riders, in stereotypes | 27 |