Crossword Genius

Only one of the denizens of the deep (4)

Ross

I believe the answer is:

sole

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'only one' is the definition.

I don't understand the rest of the clue.

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(Other definitions for sole that I've seen before include "Exclusive class of fish" , "Dover - -" , "Unique" , "Underside of the foot" , "O __ Mio (Neapolitan song)" .)

I've seen this clue in the Evening Standard.
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