Earn editor's backing and be good enough (7)
I believe the answer is:
deserve
'earn' is the definition.
(I've seen this before)
'editor's backing and be good enough' is the wordplay.
'editor' becomes 'ed' (abbreviation).
'backing' is a reversal indicator.
'and' says to put letters next to each other.
'be good enough' becomes 'serve' (serve can mean to be good enough for a purpose).
'ed' written backwards gives 'de'.
'de'+'serve'='DESERVE'
(Other definitions for deserve that I've seen before include "Justify" , "Show one is worthy" , "rate" , "Merit, earn" , "Severed (anag)" .)