Whipped cream isn't for rascal (9)
I believe the answer is:
miscreant
'for rascal' is the definition.
(thesaurus)
'whipped cream isn't' is the wordplay.
'whipped' indicates anagramming the letters.
'cream'+'isnt'='creamisnt'
'creamisnt' with letters rearranged gives 'MISCREANT'.
(Other definitions for miscreant that I've seen before include "Villainous" , "criminal" , "culprit" , "behaving unlawfully" , "villain" .)