Party with vegetables only (6)

I believe the answer is:

greens

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'party' is the definition.
(the Green Party is a political party)

I cannot understand how the rest of the clue works.

(Other definitions for greens that I've seen before include "Money" , "Nature lovers" , "You may be putting on these" , "Vegetables (found on golf courses?)" , "Vegetables - on the golf course?" .)

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

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