What a poacher may cook for breakfast (4)
I believe the answer is:
'breakfast' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps there's an association between them I don't understand?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for eggs that I've seen before include "Roe" , "Don't put all these in one basket" , "Oval food items" , "Contents of nests" , "Reproductive cells" .)