Crossword Genius

A peach in mustard, perhaps? (3,5)

Ross

I believe the answer is:

hot stuff

'a peach' is the definition.
(both can mean an attractive person)

I don't understand how the remainder of the clue works.

(Other definitions for hot stuff that I've seen before include "Dish" , "Recently stolen items" , "Such a talented person" , "Exciting thing" , "latest gear" .)

I've seen this clue in The Times.
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