Crossword Genius

Informally, a member of the Paridae family of passerine birds (3)

Ross

I believe the answer is:

tit

(Other definitions for tit that I've seen before include "What you swap for tat" , "18's [BIRD]" , "Small bird that lives off insects" , "useless horse, or not?" , "Boob made backing" .)

I've seen this clue in The Times and The Sunday Times.
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