Good access for aristocracy (6)
I believe the answer is:
gentry
'aristocracy' is the definition.
(I know that aristocracy can be written as gentry)
'good access' is the wordplay.
'good' becomes 'g' (abbreviation).
'access' becomes 'entry' (entry is a kind of access).
'g'+'entry'='GENTRY'
'for' is the link.
(Other definitions for gentry that I've seen before include "People of high birth" , "Minor aristocracy" , "aristocrats" , "cream?" , "People of good breeding" .)