French artist has wise decision initially overturned (5)
I believe the answer is:
degas
'french artist' is the definition.
(Edgar Degas, 1834-1917)
'wise decision initially overturned' is the wordplay.
'wise' becomes 'sage' (similar in meaning).
'initially' says to take the initial letters.
'overturned' says the letters should be written backwards.
The first letter of 'decision' is 'd'.
'sage'+'d'='saged'
'saged' in reverse letter order is 'DEGAS'.
'has' acts as a link.
(Other definitions for degas that I've seen before include "Edgar --, French artist" , "Edgar ---, ballet-dancer painter" , "Edgar -, French impressionist" , "French painter of ballet girls etc" , "French impressionist painter, d. 1917" .)