Crossword Genius

Battle 4, perhaps, to stop in London (9)

Ross

I think it could be either:

Which length description are you looking for?:

9

9,6
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'battle' is the definition.
(Trafalgar is an example)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for trafalgar that I've seen before include "Public space in central London" , "Nelson battle and London Square" , "Cape" , "Nelson's eighteen hundred and five victory" , "Battle won by Nelson in 1805" .)

I've seen this clue in The Guardian.
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