| 100% | SUSIE | 5 | "If You Knew ____" |
| 100% | SUSIE | 5 | Eddie Cantor hit, If You Knew __ |
| 99% | ORELSE | 6 | "... if you know what's good for you!" |
| 96% | UNCERTAIN | 9 | If you know or decide, then you can't be this |
| 91% | SUSIE | 5 | "If You Knew ___" |
| 91% | ONLY | 4 | "If ___ you knew!" |
| 89% | HAPPY | 5 | If you're this and you know it, clap your hands |
| 87% | ONLY | 4 | "If you ___ knew!" |
| 87% | YOURHANDS | 9 | Clap them if you're happy and you know it |
| 86% | SEER | 4 | If you were one, you'd already know the answer to this clue |
| 85% | ORELSE | 6 | "... and you know what happens if you don't!" |
| 83% | ESP | 3 | If you have it, you might know what this answer is without reading the clue |
| 83% | SUSIE | 5 | "If You Knew ___" (Eddie Cantor favorite) |
| 83% | SUSIE | 5 | "If You Knew _____, Like ..." (1925 hit) |
| 82% | WINKWINK | 8 | "If you know what I mean . . ." |
| 82% | WISK | 4 | Erstwhile laundry detergent brand (Tsk, tsk, tsk if you don't know it!) |
| 80% | ICANT | 5 | "I'll let you know if ___ make it on time.": 2 wds. |
| 77% | SPIN | 4 | "Did you know, we can ___ 1a to tell if it's raw or boiled?" |
| 74% | RSVP | 4 | "Let me know if you're coming" |
| 74% | RSVPED | 6 | Let someone know if you can go |
| 74% | PATTI | 5 | "If Only You Knew" singer LaBelle |
| 74% | LABELLE | 7 | “If Only You Knew” singer Patti |
| 72% | RSVP | 4 | "Let me know if you're coming" letters |
| 72% | ABLE | 4 | "Let us know if you're ___ to attend" |
| 72% | RSVP | 4 | "Let us know if you're coming" initials |
| 72% | RSVP | 4 | "Let us know if you're coming" letters |
| 72% | RSVP | 4 | "Let us know if you're coming": Abbr. |
| 72% | RSVP | 4 | "Let me know if you're coming" initials |
| 72% | LASTCALL | 8 | "If you want one, let me know now!" |
| 72% | KISSA | 5 | "Would you ___ frog if you knew he was a prince?": 2 wds. |