A real sort of aristocrat (4)
I believe the answer is:
earl
'aristocrat' is the definition.
(earl is a kind of aristocrat)
'a real sort' is the wordplay.
'sort' indicates an anagram.
'real' with letters rearranged gives 'EARL'.
'of' is the link.
(Other definitions for earl that I've seen before include "House member" , "Rank immediately above viscount" , "British peer and Dublin street" , "Real kind of English lord" , "A real peer" .)