Herb in the mint family (5)
I believe the answer is:
thyme
'herb in the mint family' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for thyme that I've seen before include "Aromatic culinary herb; sounds like occasion" , "Leaves used as seasoning" , "Aromatic ingredient" , "Ingredient in cooking" , "Culinary herb of the mint family" .)