Fate involves dairy product (4)
I believe the answer is:
feta
'dairy product' is the definition.
(type of cheese)
'fate involves' is the wordplay.
'involves' is an anagram indicator.
'fate' anagrammed gives 'FETA'.
(Other definitions for feta that I've seen before include "Type of cheese" , "Salty goat or sheep milk cheese" , "Greek cheese from goat or sheep milk" , "Greek sheep or goats' cheese" , "Greek 8 across" .)