Not the underclothes to be removed -- rascal! (9)
I believe the answer is:
scoundrel
'rascal' is the definition.
(thesaurus)
'not the underclothes to be removed' is the wordplay.
'not' is a deletion indicator.
'to be removed' indicates anagramming the letters (moved again).
'underclothes' with 'the' taken away is 'underclos'.
'underclos' with letters rearranged gives 'SCOUNDREL'.
(Other definitions for scoundrel that I've seen before include "Bounder" , "Unprincipled rogue" , "Knave" , "Villain" , "A rogue or dishonest person" .)