Gathering in the garden, perhaps (5)

I believe the answer is:

party

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'gathering' is the definition.
(I know that party is a type of social affair)

I can't explain the rest of the clue.

(Other definitions for party that I've seen before include "Political group; function" , "Bash" , "Social function" , "Social occasion - political group" , "festive" .)

I've seen this clue in the Evening Standard.

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