Debate position (3)
I believe the answer is:
con
'debate position' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for con that I've seen before include "Deception; disadvantage" , "Swindle, deception" , "Swindle or trick someone" , "Rook" , "Deceive; prisoner" .)