Chap well-dressed in red and yellow (5)

I believe the answer is:

dandy

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'chap well-dressed' is the definition.
I can't judge whether this defines the answer.

'in red and yellow' is the wordplay.
'in' indicates a hidden word.
'DANDY' is hidden in the letters of 'red and yellow'.

Can you help me to learn more?

(Other definitions for dandy that I've seen before include "Fashionable fellow" , "Fine for American" , "Old comic" , "Marathon running strips" , "Fop; excellent (US)" .)

I've seen this clue in The Sun.

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