Out-and-out blue's Conservative (9)
I believe the answer is:
downright
'out-and-out' is the definition.
(thesaurus)
'blue's conservative' is the wordplay.
'blue' becomes 'down' (I've seen this before).
'conservative' becomes 'right' ('right' can be similar in meaning to 'conservative').
'down'+'right'='DOWNRIGHT'
(Other definitions for downright that I've seen before include "Unequivocally" , "Blatant" , "blunt" , "Utter, arrant" , "Out-and-out" .)