Food used as lure (4)
I believe the answer is:
bait
'food used as lure' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for bait that I've seen before include "Used to lure fish or other animals into danger" , "Set a trap with food" , "Boilie, for example" , "Food to entice fish; taunt" , "Fishing lure" .)