Disapproving pair of Conservatives about Democrat backing article (12)
I believe the answer is:
condemnatory
'disapproving' is the definition.
(condemnatory means showing disapproval)
'pair of conservatives about democrat backing article' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is present in the answer.
'conservatives' could be 'c' (abbreviation in UK politics) and 'c' is present in the answer.
'about' could be 'a' (abbreviation in Chambers) and 'a' is located in the answer.
'democrat' could be 'dem' (common abbreviation in US politics) and 'dem' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for condemnatory that I've seen before include "Disapproving" , "Severely critical" .)