Extremely debatable -- intended to make challenge (8)
I believe the answer is:
defiance
'challenge' is the definition.
(defiance is a kind of challenge)
'extremely debatable intended' is the wordplay.
'extremely' says to hollow out the word (remove centre letters).
'intended' becomes 'fiance' (I've seen this before).
'debatable' with its centre removed is 'de'.
'de'+'fiance'='DEFIANCE'
'to make' is the link.
(Other definitions for defiance that I've seen before include "Insubordination" , "open disobedience" , "Hostile challenge" , "Resistance to authority" , "show of rebellion" .)