Eat away in a buffet cheaply enough, perhaps (4)
I believe the answer is:
etch
'eat away' is the definition.
(I've seen this before)
'a buffet cheaply enough perhaps' is the wordplay.
'ETCH' is hidden in amongst the letters.
However, I am not sure how this is indicated.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for etch that I've seen before include "Draw on metal with acid" , "Engrave; fix firmly" , "Cut using sharp instrument" , "Design on metal or glass using acid" , "Make deep lines" .)