Dress some cut off (7)
I believe the answer is:
costume
'dress' is the definition.
(costuming is a kind of dressing)
'some cut off' is the wordplay.
'off' indicates anagramming the letters.
'some'+'cut'='somecut'
'somecut' anagrammed gives 'COSTUME'.
(Other definitions for costume that I've seen before include "Actor's attire" , "Outfit" , "Duds" , "Theatrical clothes" , "Clothes for a play or fancy dress ball" .)