In a merry state, cite a free thing used by coffee drinkers (9)
I believe the answer is:
cafetiere
'thing used by coffee drinkers' is the definition.
(a cafetiere is used to make coffee)
'in a merry state cite a free' is the wordplay.
'in a merry state' indicates anagramming the letters (letters in a drunken or merry state).
'cite'+'a'+'free'='citeafree'
'citeafree' with letters rearranged gives 'CAFETIERE'.
(Other definitions for cafetiere that I've seen before include "coffee-maker" , "Jug with filter used to make coffee" , "Drink supplier" , "Coffee pot" .)