Crossword Genius

Port has only swimmer (5,4)

Ross

I believe the answer is:

dover sole

'swimmer' is the definition.
(type of fish)

'port has only' is the wordplay.
'port' becomes 'dover' (English port).
'has' is a charade indicator (letters next to each other).
'only' becomes 'sole' (synonyms).
'dover'+'sole'='DOVER SOLE'

(Other definitions for dover sole that I've seen before include "Catch" , "Kentish flat fish" .)

I've seen this clue in The Mirror.
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