Bash for beastly fun in the gulf (8)

I believe the answer is:

bunfight

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'bash' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

'beastly fun in the gulf' is the wordplay.
'beastly' indicates anagramming the letters (I've seen this in other clues).
'in the' means one lot of letters goes inside another.
'gulf' becomes 'bight' (I've seen this in another clue).
'fun' with letters rearranged gives 'unf'.
'unf' going inside 'bight' is 'BUNFIGHT'.

'for' acts as a link.

Can you help me to learn more?

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

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

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