One stirring up cream, say, added to fish a little squirt!

I believe the answer is:

whippersnapper

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(Other definitions for whippersnapper that I've seen before include "Nonentity" , "Pipsqueak" , "Cheeky youngster" , "brash youngster" , "Scallywag" .)

I've seen this clue in The Telegraph.

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