One fished out of the Solent? (4)

I believe the answer is:

sole

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'one' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

(Other definitions for sole that I've seen before include "A lone flat fish?" , "A fish; part of shoe" , "swimmer" , "Lone; part of foot" , "Exclusive class of fish" .)

I've seen this clue in the Evening Standard.

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