Possibly voting yes to keep Queen's autonomy (11)
I believe the answer is:
sovereignty
'autonomy' is the definition.
(sovereignty is a kind of autonomy)
'possibly voting yes to keep queen's' is the wordplay.
'possibly' indicates anagramming the letters.
'to keep' is an insertion indicator.
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'voting'+'yes'='votingyes'
'votingyes' is an anagram of 'soveignty'.
'soveignty' going around 'er' is 'SOVEREIGNTY'.
(Other definitions for sovereignty that I've seen before include "Self-government" , "Pre-eminence" , "it rules!" .)