Rapidly consumed oriental repast (5)
I believe the answer is:
feast
'repast' is the definition.
(feast is a kind of repast)
'rapidly consumed oriental' is the wordplay.
'rapidly' becomes 'fast' ('fast' can be a synonym of 'rapidly').
'consumed' indicates putting letters inside.
'oriental' becomes 'e'.
'fast' enclosing 'e' is 'FEAST'.
(Other definitions for feast that I've seen before include "Lavish meal" , "Celebration" , "Beano" , "Repast" , "(Eat) a rich meal" .)