Rosemary or mint (4)
I believe the answer is:
herb
I believe this clue is a double definition.
'rosemary' is the first definition.
(thesaurus)
'mint' is the second definition.
(thesaurus)
(Other definitions for herb that I've seen before include "Plant used for flavour" , "Simple" , "man's name" , "Chives or coriander, say" , "Rosemary, for example" .)