Not far from one argument (4)
I believe the answer is:
near
'not far' is the definition.
('near' is the opposite to 'far')
'from one argument' is the wordplay.
'from' says the answer is hidden in the clue.
'NEAR' is hidden in the letters of 'one argument'.
(Other definitions for near that I've seen before include "Miserly; approach" , "Verging on" , "Close-fisted - approach" , "(Get) close to" , "Tight-fisted" .)