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"past" is also used as a crossword clue. If that's what you saw, the answer is often onetime (7 letters).
Definitions
Earlier time; gone by
Word origin
From Middle English passed, past participle of passen (“to pass, to go by”), whence Modern English pass.
Used in a sentence
“a book about a time machine that can transport people back into the past”
“1830, Daniel Webster, a speech The past, at least, is secure.”
“The present is only intelligible in the light of the past, often a very remote past indeed.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer5 curated clues
01“Time already gone”4 letters
02“Time already gone by”4 letters
03“Time before now”4 letters
04“Time gone by”4 letters
05“Earlier time”4 letters
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