Mail unfair in review for novel (10)
I believe the answer is:
unfamiliar
'novel' is the definition.
(novel can mean new or unfamiliar)
'mail unfair in review' is the wordplay.
'in review' indicates an anagram.
'mail'+'unfair'='mailunfair'
'mailunfair' is an anagram of 'UNFAMILIAR'.
'for' acts as a link.
(Other definitions for unfamiliar that I've seen before include "Unknown" , "Not recognised" , "Strange" , "novel" .)