Herbal tea (6)
I believe the answer is:
tisane
'herbal tea' is the definition.
(tisane is a kind of herbal tea)
This is the entire clue.
(Other definitions for tisane that I've seen before include "Infusion (eg of herbs or flowers)" , "relaxing drink" , "Herb-tea" , "Herb tea" , "Herbal tea drink" .)