Fail foolishly to accept the current beauty treatment (6)
I believe the answer is:
facial
'beauty treatment' is the definition.
(I've seen this before)
'fail foolishly to accept the current' is the wordplay.
'foolishly' is an anagram indicator.
'to accept' is an insertion indicator.
'the current' becomes 'ac' (alternating current).
'fail' with letters rearranged gives 'fial'.
'fial' enclosing 'ac' is 'FACIAL'.
(Other definitions for facial that I've seen before include "Type of beauty treatment" , "Beauty treatment for front of head" , "Cosmetic treatment" , "Beauty treatment, maybe mudpack" , "Beauty treatment for the visage" .)