Stick a coin in to get something to eat (6)
I believe the answer is:
canape
'something to eat' is the definition.
(canape is a kind of food)
'stick a coin in' is the wordplay.
'stick' becomes 'cane' (cane is a kind of stick).
'coin' becomes 'p' (abbreviation for pence).
'in' means one lot of letters goes inside another.
'a'+'p'='ap'
'cane' placed around 'ap' is 'CANAPE'.
'to get' acts as a link.
(Other definitions for canape that I've seen before include "Savoury party fare" , "Small piece of bread or biscuit with savoury spread" , "Small savoury on toast or bread" , "Hors d'oeuvre" , "part of a buffet?" .)