Cheese omelette finally produced by mother (4)
I believe the answer is:
edam
'cheese' is the definition.
(I've seen this before)
'omelette finally produced by mother' is the wordplay.
'finally' indicates one should take the final letters.
'produced by' says to put letters next to each other.
'mother' becomes 'dam' (female parent of an animal).
The final letter of 'omelette' is 'e'.
'e'+'dam'='EDAM'
(Other definitions for edam that I've seen before include "Round, yellow cheese" , "Mild yellow Dutch cheese" , "town in Holland" , "Type of cheese" , "Dutch 8 across" .)