Devour — mock (5)
I believe the answer is:
scoff
This clue is a double definition.
'devour' is the first definition.
(I've seen this before)
'mock' is the second definition.
(scoff can mean to mock or tease)
(Other definitions for scoff that I've seen before include "Jeer; eat greedily" , "taunt" , "Quickly swallow" , "Speak derisively" , "Eat like a pig" .)