| Furry guard | 11 |
| Doberman e.g. | 14 |
| Burglar alarm alternative | 25 |
| Home security units that eat | 28 |
| Viewed the Marxes | 17 |
| People on vigil | 15 |
| They might be wound up | 22 |
| Sentries' jobs | 18 |
| Vest pocket item | 16 |
| Closely observant | 17 |
| Vigilant deity? | 15 |
| Girl ___, male activity on a beach | 34 |
| Surveillance camera? | 20 |
| Young couple's lament (Part 3) | 34 |
| Like a Nielsen family, presumably | 33 |
| ''Careful!'' | 28 |
| Relative of "Look out!" | 33 |
| Winder for a timepiece | 22 |
| Carefully guard | 15 |
| He has time on his hands | 24 |
| Swiss __ (precision craftspersons) | 34 |
| Experts at clockwork | 20 |
| Security staffer | 16 |
| Response to 'You wouldn't!' | 39 |
| "I'll demonstrate ..." | 36 |
| Theme of this puzzle, whose members are hidden throughout the grid | 66 |
| Security folk | 13 |
| First ones to spot the king's ghost, in "Hamlet" | 62 |
| What some federal agents do? | 28 |
| "While I'm away on vacation, would you ___...?" | 61 |
| Exhibit sure footing | 20 |
| Be cautious about calories | 26 |
| 1941 Lillian Hellman play | 25 |
| Play about Lorelei's timepiece? | 35 |
| "Duck" call? | 22 |
| Digital display, battery, etc.? | 31 |
| Pouch in a vest | 15 |
| Band on a timepiece | 19 |
| What a couch potato might do | 28 |
| What you might hear before being shot | 37 |
| Impatiently endure passing time | 31 |
| Promo for "The Daily Antelope"? | 41 |
| What astronauts do on Labor Day? | 32 |
| Billboard line | 14 |
| Lookout post | 12 |
| Sentry's lookout | 20 |
| Lookout's post | 18 |
| See some lighthouses? | 21 |
| What lip readers do | 19 |
| Lipreaders do it | 16 |
| Lip readers do this | 19 |
| "Don't be a blabbermouth ..." | 43 |
| Ceiling sign? | 13 |
| "Use a mirror to practice puckering" | 46 |
| ... to the river | 16 |
| Cautionary sign at a dog park? | 30 |
| Warning atop an escalator | 25 |
| OPEN FLOOR PLAN! | 16 |
| Warning to a Russian hiker | 26 |
| Sign at the Ukrainian tourism bureau? | 37 |
| Advice to Claudius, in "Hamlet"? | 42 |
| Additive advice? | 16 |
| Enjoy "The Devil Wears Prada"? | 40 |
| Site of a 1972 break-in | 23 |
| No-cal drink | 12 |
| Spring offering | 15 |
| Tend to, as flowers | 19 |
| Tend to the garden | 18 |
| Firefighting need | 17 |
| Well-managed resource? | 22 |
| Ocean contents | 14 |
| Oasis offering | 14 |
| Oasis find | 10 |
| Desert's dearth | 19 |
| Adam's ale | 14 |
| Word with buffalo or chestnut | 29 |
| Word that can precede the start of the theme entries | 52 |
| Tend the plants | 15 |
| Odds of being allergic to it: 1 in 230,000,000 | 46 |
| Most of our globe | 17 |
| Kind of rat or snake | 20 |
| Its freezing point is 0° Celsius | 35 |
| It may be well-taken | 20 |
| First word learned by Helen Keller | 34 |
| Fire fighter | 12 |
| Din's burden | 16 |
| Bottled buy | 11 |
| "Smoke on the ___" | 28 |
| Word with well or tap | 21 |
| Word with bed or log | 20 |
| What carbon dioxide reacts with to form carbonic acid | 53 |
| Well fill | 9 |
| Venetian pavement | 17 |
| Use a hose on, as a garden | 26 |
| Treasure in a desert | 20 |
| Tend, as houseplants | 20 |
| Tend to, as plants | 18 |
| Tend the plants, in a way | 25 |
| Take care of the plants | 23 |
| Spring, essentially | 19 |