Aromatic plant used in cookery (4)
I believe the answer is:
herb
'aromatic plant used in cookery' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for herb that I've seen before include "Basil, perhaps" , "Wayside plant with small red flowers" , "Simple" , "Mint possibly" , "Medicinal or culinary plant" .)