Crossword Genius

But it could be one to play (4)

Ross

I believe the answer is:

work

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'one to play' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for work that I've seen before include "Tasks to be undertaken" , "Wildly happy" , ". . . get on with serious business" , "Function; task" , "Toil" .)

I've seen this clue in the Evening Standard.
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