Consume meal, beginning to end (3)
I believe the answer is:
'consume' is the definition.
(eating is a kind of consuming)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for eat that I've seen before include "get stuck in" , "Partake of" , "Bit, chew and swallow" , "and 27: Be humiliated" , "Ingest" .)