Fabulous creature to agree with artist (7)
I believe the answer is:
chimera
'fabulous creature' is the definition.
(I've seen this before)
'agree with artist' is the wordplay.
'agree' becomes 'chime'.
'with' says to put letters next to each other.
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'chime'+'ra'='CHIMERA'
'to' is the link.
(Other definitions for chimera that I've seen before include "A wild fancy" , "Lion-headed monster" , "phantom" , "fantasy" , "Fantastic creation of the mind, like Greek mythical monster" .)