Metal grating to cook eggs initially (6)
I believe the answer is:
grille
'metal grating' is the definition.
(I've seen this in another clue)
'cook eggs initially' is the wordplay.
'cook' becomes 'grill' (grilling is a form of cooking).
'initially' suggests taking the first letters.
The initial letter of 'eggs' is 'e'.
'grill'+'e'='GRILLE'
'to' is the link.
(Other definitions for grille that I've seen before include "Part of an air-cooling system" , "Protective metal framework" , "It affords ventilation" , "Protective lattice" , "Grating, metal screen" .)