Feta production is destiny (4)
I believe the answer is:
fate
'destiny' is the definition.
('fate' can be a synonym of 'destiny')
'feta production' is the wordplay.
'production' indicates anagramming the letters.
'feta' is an anagram of 'FATE'.
'is' acts as a link.
(Other definitions for fate that I've seen before include "E.g. Clotho, Atropos" , "One's lot" , "Predetermined end" , "Lady luck" , "Fortune" .)