Feta production is destiny (4)
I believe the answer is:
fate
'is destiny' is the definition.
(I've seen this before)
'feta production' is the wordplay.
'production' indicates anagramming the letters.
'feta' with letters rearranged gives 'FATE'.
(Other definitions for fate that I've seen before include "E.g. Clotho, Atropos" , "One's lot" , "Predetermined end" , "Lady luck" , "Fortune" .)