Unconventional Tory ally — one long excluded from privileged family (7)
I believe the answer is:
royalty
'privileged family' is the definition.
(royal family)
'unconventional tory ally one long excluded' is the wordplay.
'unconventional' indicates an anagram.
'one long' becomes 'l'.
'excluded' suggests deleting specific letters.
'tory'+'ally'='toryally'
'toryally' with 'l' taken away is 'toryaly'.
'toryaly' anagrammed gives 'ROYALTY'.
'from' acts as a link.
(Other definitions for royalty that I've seen before include "Payment made to a copyright holder for its use" , "percentage earned" , "(Rank of) kings and queens" , "King or queen's status" , "Sovereignty" .)