Sea Mist - a creation of a French artist (7)
I believe the answer is:
matisse
'a french artist' is the definition.
(I've seen this before)
'sea mist a creation' is the wordplay.
'a creation' indicates anagramming the letters.
'sea'+'mist'='seamist'
'seamist' anagrammed gives 'MATISSE'.
'of' acts as a link.
(Other definitions for matisse that I've seen before include "French painter, Henri, d.1954" , "Henri -, nineteenth-twentieth century French painter/sculptor" , "Henri --, French artist" , "French impressionist" , "Mae sits badly for the French painter" .)