Politicians having fun together? (5)

I believe the answer is:

party

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'together?' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I can't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for party that I've seen before include "eg Labour, Conservative" , "Political group - celebration" , "Bash" , "Social function" , "Political organisation" .)

I've seen this clue in the Evening Standard.

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