Bird put out about a £50 note (6)

I believe the answer is:

pullet

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'bird' is the definition.
(pullet is a kind of bird)

I can't explain the rest of the clue.

(Other definitions for pullet that I've seen before include "Chicken under one year old" , "Young chicken" , "No high-flyer" , "A young domestic hen less than one year old" , "Domestic hen less than 1 year old" .)

I've seen this clue in the Evening Standard.

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