| Clue | Length | Answer |
|---|---|---|
| "Once ...... ..." | 3 letters | for |
| "Once ...... ..." | 4 letters | erse |
| "Once ...... ..." | 4 letters | then |
| "Once ...... ..." | 4 letters | upon |
| "Once ...... ..." | 4 letters | time |
| "Once ...... ..." | 4 letters | erst |
| "Once ...... ..." | 5 letters | allat |
| "Once ...... ..." | 5 letters | upona |
| "Once ...... ..." | 5 letters | prior |
| "Once ...... ..." | 6 letters | recent |
| "Once ...... ..." | 7 letters | quondam |
| "Once ...... ..." | 7 letters | onetime |
| "Once ...... ..." | 8 letters | one-time |
| "Once ...... ..." | 8 letters | previous |
| "Once ...... ..." | 8 letters | primeval |
| "Once ...... ..." | 8 letters | sometime |
| "Once ...... ..." | 8 letters | assoonas |
| "Once ...... ..." | 8 letters | whenever |
| "Once ...... ..." | 8 letters | formerly |
| "Once ...... ..." | 9 letters | awhileago |
| "Once ...... ..." | 9 letters | primitive |
| "Once ...... ..." | 9 letters | severally |
| "Once ...... ..." | 10 letters | previously |
| "Once ...... ..." | 10 letters | straightly |
| "Once ...... ..." | 10 letters | singularly |
| "Once ...... ..." | 10 letters | separately |
| "Once ...... ..." | 10 letters | obligation |
| "Once ...... ..." | 11 letters | immediately |
| "Once ...... ..." | 11 letters | prehistoric |
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