Title of novel older man left unfinished (7)
I believe the answer is:
earldom
'title' is the definition.
(I've seen this before)
'novel older man left unfinished' is the wordplay.
'novel' indicates anagramming the letters (letters in a new or novel order).
'left unfinished' means to remove the last letter.
'older'+'man'='olderman'
'olderman' with its final letter taken away is 'olderma'.
'olderma' anagrammed gives 'EARLDOM'.
'of' is the link.
(Other definitions for earldom that I've seen before include "noble area of country" , "Nobleman's estate" , "Lands of a nobleman" , "Peer's rank" , "Noble's lands or rank" .)