Parsley, sage, rosemary or thyme (4)
I believe the answer is:
herb
'parsley sage rosemary or thyme' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for herb that I've seen before include "Medicinal or culinary plant" , "Useful or edible plant" , "Plant used in cooking" , "Plant used in medicine or cookery" , "Mint possibly" .)