Female account regularly dismissed miracle beauty treatment (6)
I believe the answer is:
facial
'beauty treatment' is the definition.
(I've seen this in another clue)
'female account regularly dismissed miracle' is the wordplay.
'female' becomes 'f' (abbreviation).
'account' becomes 'ac' (abbreviation for account).
'regularly dismissed' means one should take alternating letters (letters dismissed at regular intervals).
The alternating letters of 'miracle' are 'ial'.
'f'+'ac'+'ial'='FACIAL'
(Other definitions for facial that I've seen before include "Cosmetic treatment" , "Beauty treatment for the visage" , "Beauty treatment, maybe mudpack" , "Beauty treatment for front of head" , "Type of beauty treatment" .)