Passerine songbird (7)

I believe the answer is:

wagtail

(Other definitions for wagtail that I've seen before include "Slender songbird - a law git (anag)" , "singer" , "Songbird - gala wit (anag)" , "'Bird, its posterior projection jerks up and down (7)'" , "Common bird" .)

I've seen this clue in the Evening Standard and The Mirror.

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