Quiche ingredients (4)
I believe the answer is:
eggs
'quiche ingredients' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eggs that I've seen before include "Don't put all these in one basket" , "Don't teach your grandmother to suck --" , "Wherein soldiers enter" , "Urges (on)" , "Bombs or mines (slang)" .)