Crossword Genius

Are just what's needed for a bird feeding its young (4,3,4)

Ross

I believe the answer is:

fill the bill

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for fill the bill that I've seen before include "Be exactly what is needed" , "meet requirements?" , "feed hungry pelican?" , "What a hungry pelican must do" , "For a pelican, fish might" .)

I've seen this clue in the Evening Standard.
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