What one does in polo gives trouble (5,2)

I believe the answer is:

plays up

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'gives trouble' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for plays up that I've seen before include "Gives undue prominence to" , "Spotlights" , "gives trouble" .)

I've seen this clue in The Sun.

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