Salad garnish (5)
I believe the answer is:
cress
'salad garnish' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cress that I've seen before include "Salad sprouts" , "Plant with pungent leaves used in salads" , "Green cold salad ingredient" , "Salad vegetable" , "Toll of bell" .)