French toast ingredient (3)
I believe the answer is:
egg
'french toast ingredient' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for egg that I've seen before include "Mine (slang)" , "On the face, it's embarrassing" , "It may be poached" , "Reproductive cell" , "It comes before or after the chicken?" .)