Crossword Genius

Bobbing songbird (7)

Ross

I believe the answer is:

wagtail

(Other definitions for wagtail that I've seen before include "Small bird (pied/yellow)" , "singer" , "'Bird, its posterior projection jerks up and down (7)'" , "Common bird" , "I tag law of the bird" .)

I've seen this clue in The Mirror.
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