Opposed to party faction's twisted solutions (9)
I believe the answer is:
antidotes
'solutions' is the definition.
Although both the answer and definition are plural nouns, I can't see how they can define each other.
'opposed to party faction's twisted' is the wordplay.
'opposed to' becomes 'anti' (I've seen this in another clue).
'party' becomes 'do' (do is a kind of party).
'faction's twisted' becomes 'tes' (I can't justify this - if you can you should give a lot more credence to this answer).
'anti'+'do'+'tes'='ANTIDOTES'
Can you help me to learn more?
(Other definitions for antidotes that I've seen before include "Counteractions to poisons" , "Remedies" , "Cures for poisons" .)