Burger garnish (5)
I believe the answer is:
onion
'burger garnish' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for onion that I've seen before include "Bulb used in cooking" , "it can bring tears" , "One may be set" , "Edible tear-jerker" , "reason for tears" .)