Crossword Genius

Working hard

Ross

I believe the answer is:

atit

'working hard' is the definition.
(someone working on a particular task is 'at it')

This is all the clue.

(Other definitions for atit that I've seen before include "up to no good?" , "in Congress" , "what birds (and bees) do?" .)

I've seen this clue in The New York Times.
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