Crossword Genius

Certain counties are finished with it! (3)

Ross

I believe the answer is:

sex

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'it' is the definition.
('it' is a common euphemism for sex)

I can't explain the remainder of the clue.

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(Other definitions for sex that I've seen before include "Male or female" , "This symbol is epitome of glamour" , "Hanky-panky" , "VI (Lat.); m. or f." , "Gender" .)

I've seen this clue in the Evening Standard.
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