Crossword Genius

Roughly in Latin (5)

Ross

I believe the answer is:

circa

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'roughly' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for circa that I've seen before include "Costa del Sol city" , "More or less" , "Close to" , "Around (Latin)" , "About, say, a date" .)

I've seen this clue in The Mirror.
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