Crossword Genius

Only; flatfish (4)

Ross

I believe the answer is:

sole

I believe this is a double definition.

'only' is the first definition.
(I know that only can be written as sole)

'flatfish' is the second definition.
(sole is a kind of flatfish)

(Other definitions for sole that I've seen before include "swimmer" , "fish in the sea!" , "Lone; part of foot" , "Shoe part -- lone" , "Kind of fish - lose it" .)

I've seen this clue in The Hindu and The Times.
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