Myrrh's thrown over European scribes such as McGonagall (7)
I believe the answer is:
rhymers
'scribes such as mcgonagall' is the definition.
(as in William McGonagall, notoriously bad poet)
'myrrh's thrown over european' is the wordplay.
'thrown' is an anagram indicator.
'over' means one lot of letters goes inside another.
'european' becomes 'E' (abbreviation e.g. EU).
'myrrhs' is an anagram of 'rhymrs'.
'rhymrs' placed around 'e' is 'RHYMERS'.
(Other definitions for rhymers that I've seen before include "literary poets" , "Versifiers" .)