Crossword Genius

Only individual, say (4)

Ross

I believe the answer is:

sole

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This could be a double definition.

'only' is the first definition.
(synonyms)

'individual say' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

Can you help me to learn more?

(Other definitions for sole that I've seen before include "Exclusive class of fish" , "A lone sort of fish - lose it" , "A lonely sort of flatfish" , "Bottom of the foot" , "A lone flat fish?" .)

I've seen this clue in The Hindu.
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