Dairy product perfect female fed to vampire? (9)
I believe the answer is:
butterfat
'dairy product' is the definition.
(I've seen this before)
'perfect female fed to vampire?' is the wordplay.
'perfect' becomes 'utter' (synonyms).
'female' becomes 'f' (common abbreviation).
'fed to' is an insertion indicator.
'vampire?' becomes 'bat' (vampire bat).
'utter'+'f'='utterf'
'utterf' inserted into 'bat' is 'BUTTERFAT'.
(Other definitions for butterfat that I've seen before include "Ingredient of milk" , "Dairy product" .)