Decanter for artist in bistro (6)
I believe the answer is:
carafe
'decanter' is the definition.
(I know that decanter can be written as carafe)
'artist in bistro' is the wordplay.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'in' means one lot of letters goes inside another.
'bistro' becomes 'cafe' (I've seen this in another clue).
'ra' placed into 'cafe' is 'CARAFE'.
'for' is the link.
(Other definitions for carafe that I've seen before include "Serving vessel for water or wine" , "Decanter" , "Wide-necked bottle for water or wine" , "Wine-flask" , "Open-topped container for wine or water" .)