Culinary plant (4)
I believe the answer is:
herb
'culinary plant' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for herb that I've seen before include "Medicinal or culinary plant" , "Mint possibly" , "Type of plant used in medicine" , "Plant used in medicine or cookery" , "Chives or coriander, say" .)