Fortified wine produced by one artist (7)
I believe the answer is:
madeira
'fortified wine' is the definition.
(Madeira is an example)
'produced by one artist' is the wordplay.
'produced' becomes 'made' ('make' can be a synonym of 'produce'**).
'by' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral).
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'made'+'i'+'ra'='MADEIRA'
(Other definitions for madeira that I've seen before include "Fortified Portuguese wine" , "Dessert wine from a Portuguese Atlantic island" , "Fortified white wine from island off NW Africa" , "Sponge-cake" , "cake producer" .)