Stuff in canyon (5)
I believe the answer is:
gorge
I believe this clue is a double definition.
'stuff' is the first definition.
(as in gorging or stuffing oneself with food)
'canyon' is the second definition.
(I know that canyon can be written as gorge)
'in' acts as a link.
(Other definitions for gorge that I've seen before include "Cheddar, say" , "something close to Cheddar?" , "Gobble" , "chine" , "Defile; stuff oneself" .)