Monster to agree with artist (7)
I believe the answer is:
chimera
'monster' is the definition.
(I know that Chimera is a type of mythical creature)
'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' acts as a link.
(Other definitions for chimera that I've seen before include "wild dream" , "fake image" , "fabulous beast" , "Chair me to find mixed monster of Greek myth" , "Mythological monster" .)