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 a hidden word.
'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" .)