Price due to change for treatment (8)
I believe the answer is:
pedicure
'for treatment' is the definition.
(I have seen 'cosmetic treatment' mean 'pedicure' so perhaps 'treatment' could also mean 'pedicure')
'price due to change' is the wordplay.
'to change' indicates anagramming the letters.
'price'+'due'='pricedue'
'pricedue' with letters rearranged gives 'PEDICURE'.
(Other definitions for pedicure that I've seen before include "Price due for car of the feet" , "Beauty treatment for the feet" , "Cosmetic foot treatment" , "cutting out corn etc" , "Care and treatment of the feet and toenails" .)