Crossword Genius

It's about time! (5)

Ross

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5

6

circa

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'it's about' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for circa that I've seen before include "Approximately (Latin)" , "Preceding a date, this means about" , "Roughly" , "Approximately (of a year)" , "Approximately, around" .)

I've seen this clue in The Globe and Mail.
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