Crossword Genius

One and only (4)

Ross

I believe the answer is:

sole

'one and only' is the definition.
(synonyms)

This is all the clue.

(Other definitions for sole that I've seen before include "A lone flat fish?" , "Underside of footwear" , "Fish - alone" , "A lone sort of fish - lose it" , "O __ Mio (Neapolitan song)" .)

I've seen this clue in the LA Times and the USA Today.
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