British: why they can’t swim in resort? (9)

I believe the answer is:

blackpool

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'resort?' is the definition.
The answer and definition can be both locations as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

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

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(Other definitions for blackpool that I've seen before include "Lancashire resort" , "Northern football team" .)

I've seen this clue in The Times.

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