Gus seems to have left Pegasus something to eat! (4)
I believe the answer is:
peas
'something to eat' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for peas that I've seen before include "Legumes" , "Podded vegetables" , "Leguminous plants" , "Pulses" , "Seeds in a pod" .)