Worry about a fine decanter (6)
I believe the answer is:
carafe
'decanter' is the definition.
('carafe' can be a synonym of 'decanter')
'worry about a fine' is the wordplay.
'worry' becomes 'care' (I've seen this before).
'about' is an insertion indicator.
'a fine' becomes 'af' (I've seen this in other clues).
'care' enclosing 'af' is 'CARAFE'.
(Other definitions for carafe that I've seen before include "Wine, water, jug" , "Glass bottle in which wine is served at table" , "Serving vessel for water or wine" , "Wide-necked bottle for water or wine" , "Wide-necked bottle for the table" .)