Dope and crack for the aristocracy (6)
I believe the answer is:
gentry
'the aristocracy' is the definition.
('gentry' can be a synonym of 'aristocracy')
'dope and crack' is the wordplay.
'dope' becomes 'gen' (I've seen this in other clues).
'and' says to put letters next to each other.
'crack' becomes 'try' (I've seen this in other clues).
'gen'+'try'='GENTRY'
'for' acts as a link.
(Other definitions for gentry that I've seen before include "They're next below the nobility in position and birth" , "Upper-crust people, just below nobility" , "people of a particular sort" , "People, especially if posh" , "aristocrats" .)