Pied or yellow songbird (7)

I believe the answer is:

wagtail

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

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

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