Pickle flavoring (4)
I believe the answer is:
dill
'pickle flavoring' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dill that I've seen before include "Herb with thread-like foliage used as seasoning" , "Herb for gravadlax" , "Herb commonly used with gravlax" , "Herb; rhymes with beak" , "Medicinal herb" .)