Walk like little beasts having a bit of fun? (5)

I believe the answer is:

mince

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'walk' is the definition.
(I know that mince is a more specific form of the action walk)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for mince that I've seen before include "Shredded beef" , "Finely chopped meat" , "Chop into small pieces" , "Cut fine" , "getting chop" .)

I've seen this clue in the Evening Standard.

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