Old French artist not quite coming round (4)
I believe the answer is:
aged
'old' is the definition.
(similar in meaning)
'french artist not quite coming round' is the wordplay.
'french artist' becomes 'degas' (Edgar Degas, 1834-1917).
'not quite' means to remove the last letter (most but not all of the word).
'coming round' says the letters should be written in reverse.
'degas' with its final letter taken off is 'dega'.
'dega' written backwards gives 'AGED'.
(Other definitions for aged that I've seen before include "Antiquated" , "Ripened, matured" , "Very old, person or wine" , "Getting on" , "Got older" .)