A singer as entertainment (4)

I believe the answer is:

lark

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'a singer' is the definition.
(lark is a kind of birdanimal)

I can't explain the remainder of the clue.

(Other definitions for lark that I've seen before include "High-flying songbird" , "Bird; frolic" , "in-flight performer" , "Flighty type" , "Early bird with morning song" .)

I've seen this clue in the Evening Standard.

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