One can take it to be disputative (5)
I believe the answer is:
issue
'one can take' is the definition.
'issue' can be an answer for 'take' (synonyms). I am unsure of the 'one can' bit.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for issue that I've seen before include "Matter for discussion" , "Emit" , "Topic; give out" , "Argument" , "Edition of a publication" .)