Decanter broken? A farce (6)
I believe the answer is:
carafe
'decanter' is the definition.
('carafe' can be a synonym of 'decanter')
'broken? a farce' is the wordplay.
'broken?' indicates an anagram.
'a'+'farce'='afarce'
'afarce' anagrammed gives 'CARAFE'.
(Other definitions for carafe that I've seen before include "It may provide drink" , "Open-topped glass container" , "Wide-necked bottle for the table" , "Glass bottle for serving wine at table" , "Serving vessel for water or wine" .)