Never mind lion biting bird on wingtip? (3,2,2)

I believe the answer is:

let it go

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'never mind' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for let it go that I've seen before include "Refrain from comment" , "Excuse something" , "Hit song from Disney's 2013 animated feature film Frozen" , "Disney tune" .)

I've seen this clue in the Sydney Morning Herald.

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