Very much out of line, to be honest (4)
I believe the answer is:
fair
'honest' is the definition.
(similar in meaning)
'very much out of line' is the wordplay.
'very much' becomes 'far' (I've seen this before).
'out' means to remove the last letter.
'of line' becomes 'ir' (I can't justify this - if you can you should believe this answer much more).
'far' with its last letter removed is 'fa'.
'fa'+'ir'='FAIR'
'to be' is the link.
Can you help me to learn more?
(Other definitions for fair that I've seen before include "Satisfactory" , "Equitable - market - not bad" , "'Just, meet (4)'" , "Equitable, just (4)" , "Treating people equally" .)