Artist enters restaurant for a bottle (6)
I believe the answer is:
carafe
'a bottle' is the definition.
(carafe is a kind of bottle)
'artist enters restaurant' is the wordplay.
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'enters' is an insertion indicator.
'restaurant' becomes 'cafe' (cafe is a kind of restaurant).
'ra' going into 'cafe' is 'CARAFE'.
'for' acts as a link.
(Other definitions for carafe that I've seen before include "Wine server" , "Glass bottle in which wine is served at table" , "Wine-flask" , "Open-topped glass container" , "Source of wine" .)