Frank is out of order, don't you agree? (9)
I believe the answer is:
downright
'frank' is the definition.
(thesaurus)
'out of order don't you agree?' is the wordplay.
'out of order' becomes 'down'.
'don't you agree?' becomes 'right'.
'down'+'right'='DOWNRIGHT'
'is' is the link.
(Other definitions for downright that I've seen before include "Unequivocally" , "Utter, complete" , "blunt" , "True" , "Out-and-out" .)