Diamonds, for example, young girl put on smart dress (5,4)
I believe the answer is:
minor suit
'diamonds for example' is the definition.
'young girl put on smart dress' is the wordplay.
'young girl' becomes 'minor'.
'put on' is a charade indicator (letters next to each other).
'smart dress' becomes 'suit'.
'minor'+'suit'='MINOR SUIT'
(Other definitions for minor suit that I've seen before include "(In bridge) clubs or diamonds" , "clubs, for example" , "Clubs, say" , "clubs, perhaps" .)