Cosmetic treatment improved crude pie (8)
I believe the answer is:
pedicure
'cosmetic treatment' is the definition.
(I've seen this before)
'improved crude pie' is the wordplay.
'improved' is an anagram indicator.
'crude'+'pie'='crudepie'
'crudepie' anagrammed gives 'PEDICURE'.
(Other definitions for pedicure that I've seen before include "Cosmetic foot treatment" , "Beauty treatment for the feet" , "Care and treatment of the feet and toenails" , "Price due for car of the feet" , "cutting out corn etc" .)