Crossword Genius

It's not in mint sauce - that much is common sense (6)

Ross

I believe the answer is:

acumen

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

I don't understand the rest of the clue.

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(Other definitions for acumen that I've seen before include "Gumption" , "Penetrating insight" , "Insightfulness" , "Mental keenness" , "Sagicity as in business" .)

I've seen this clue in the Irish Times.
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