Herb tea (6)
I believe the answer is:
tisane
'herb tea' is the definition.
(tisane is a kind of herb tea)
This is all the clue.
(Other definitions for tisane that I've seen before include "Herbal tea drink" , "relaxing drink" , "Infusion of e.g. dried or fresh flowers or leaves" , "Herb tea" , "Infusion (eg of herbs or flowers)" .)