Line and range wrong, mainly (2,7)
I believe the answer is:
in general
'mainly' is the definition.
(I've seen this before)
'line and range wrong' is the wordplay.
'and' is a charade indicator (letters next to each other) (I've seen this in other clues).
'wrong' is an anagram indicator.
'line' after 'range' is 'rangeline'.
'rangeline' is an anagram of 'IN GENERAL'.
(Other definitions for in general that I've seen before include "on the whole" , "Largely" , "Overall" , "More-or-less" , "by and large" .)