Crossword Genius

An old-fashioned fop (7)

Ross

I believe the answer is:

coxcomb

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This could be a double definition.

'an old-fashioned' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'fop' is the second definition.
(I know that coxcomb is a type of fop)

Can you help me to learn more?

(Other definitions for coxcomb that I've seen before include "Vain or conceited person" , "Conceited dandy" , "Fleshy red crest on a cock's head" , "Red crest on the head of the domestic fowl" , "Fool" .)

I've seen this clue in the Evening Standard.
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