Be cooperative (4,4)

I think it could be either:

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4,4

play ball

'be cooperative' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for play ball that I've seen before include "Be cooperative" , "perform service in court" , "Co-operate" , "Agree to comply with someone else's rules" , "Most boys love to" .)

I've seen this clue in The Guardian.

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