Spooner's amusing sound of noisy gathering (8)

I believe the answer is:

bunfight

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'spooner's' is the definition.
Both the answer and definition are singular nouns.
Maybe there's a link between them I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for bunfight that I've seen before include "Grand tea party - huge argument" , "Tea party (slang)" .)

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

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