Agree artist makes a fabulous creation (7)
I believe the answer is:
chimera
'a fabulous creation' is the definition.
(mythical creature)
'agree artist' is the wordplay.
'agree' becomes 'chime'.
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'chime'+'ra'='CHIMERA'
'makes' acts as a link.
(Other definitions for chimera that I've seen before include "fantasy" , "Fantastic creation of the mind, like Greek mythical monster" , "Mythical monster, part lion, goat and serpent" , "figment of the imagination" , "Mythological monster" .)