Crossword Genius

A bird busy as a bee? (2,2)

Ross

I believe the answer is:

at it

'busy as a bee?' is the definition.
(I've seen this in another clue)

'a bird' is the wordplay.
'bird' becomes 'tit' (tit is a kind of bird).
'a'+'tit'='AT IT'

(Other definitions for at it that I've seen before include "occupied in a particular way" , "Busy" , "Engaged in something particular" , "Up to no good" , "engaged in dubious activity?" .)

I've seen this clue in The Guardian.
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