Glass container artist found in coffee bar (6)
I believe the answer is:
carafe
'glass container' is the definition.
(I've seen this before)
'artist found in coffee bar' is the wordplay.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'found in' indicates putting letters inside.
'coffee bar' becomes 'cafe' (synonyms).
'ra' placed inside 'cafe' is 'CARAFE'.
(Other definitions for carafe that I've seen before include "Glass water jug" , "in which one has wine?" , "Wine is decanted into it" , "Bottle with a stopper, for wine or water" , "Wide-necked bottle for water or wine" .)