Bum smoothing cream at first new in make-up (8)
I believe the answer is:
scrounge
'bum' is the definition.
(thesaurus)
'smoothing cream at first new in make-up' is the wordplay.
I cannot quite understand how this works, but
'new' could be 'n' and 'n' is found within the answer.
'make up' could be 'rouge' (rouging is a kind of making up) and 'rouge' is found within the remaining letters.
This may be the basis of clue (or it may be nonsense).
(Other definitions for scrounge that I've seen before include "Freeload" , "Try to get hold of" , "Seek something free from others" , "Cadge, sponge" , "Cur's gone (anag) - beg" .)