Crossword Genius

Act as party leader, unlike a minister (4)

Ross

I believe the answer is:

play

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'act as' is the definition.
(synonyms)

I don't understand the rest of the clue.

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(Other definitions for play that I've seen before include "Have fun -- theatrical work" , "Stage work" , "Drama - latitude - sport" , "Scope - entertainment" , "Theatrical production" .)

I've seen this clue in the Sydney Morning Herald.
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