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