Ruffled, glamourpuss not so sweet (9)
I believe the answer is:
sugarplum
'sweet' is the definition.
(sugarplum is a kind of sweet)
'ruffled glamourpuss not so' is the wordplay.
'ruffled' indicates anagramming the letters.
'not' suggests deleting specific letters.
'glamourpuss' with 'so' taken away is 'glamurpus'.
'glamurpus' is an anagram of 'SUGARPLUM'.
(Other definitions for sugarplum that I've seen before include "fairy dancing" , "term of endearment" , "Sweet thing" , "Dance of the ... Fairy" , "Sweet or sweetener" .)