| Clue | Length | Answer |
|---|---|---|
| Prehistoric | 3 letters | old |
| Prehistoric | 4 letters | then |
| Prehistoric | 5 letters | prime |
| Prehistoric | 5 letters | prior |
| Prehistoric | 6 letters | recent |
| Prehistoric | 6 letters | prewar |
| Prehistoric | 7 letters | quondam |
| Prehistoric | 7 letters | ancient |
| Prehistoric | 8 letters | previous |
| Prehistoric | 8 letters | sometime |
| Prehistoric | 8 letters | pristine |
| Prehistoric | 8 letters | primeval |
| Prehistoric | 9 letters | primitive |
| Prehistoric | 10 letters | protohuman |
| Prehistoric | 10 letters | primordial |
| Prehistoric | 12 letters | prelapsarian |
| Prehistoric | 13 letters | protohistoric |
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