British squadron quite chuffed about sailor flanking battle (9)

I believe the answer is:

trafalgar

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'battle' is the definition.
(Trafalgar is an example)

I can't explain the rest of the clue.

(Other definitions for trafalgar that I've seen before include "London Square with Nelson column" , "Public space in central London" , "Famous naval battle" , "1805 sea battle" , "Nelson's eighteen hundred and five victory" .)

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

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