"Au contraire!" (5)
(Other definitions for far from it that I've seen before include "By no means" , "Ma for rift? Most unlikely, too remote" , "Affirm rot? No way, quite remote" , "Well short of objective" , "On the contrary" .)
'au contraire' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for not that I've seen before include "logically, operation needed" , "Negatory word" , "A negative word" , "Having close-cut hair" , "Word of negation" .)