Late aunt's worked in Oman, perhaps (9)
I believe the answer is:
sultanate
'oman perhaps' is the definition.
(I know that Oman is a sultanate)
'late aunt's worked' is the wordplay.
'worked' is an anagram indicator.
'late'+'aunts'='lateaunts'
'lateaunts' anagrammed gives 'SULTANATE'.
'in' is the link.
(Other definitions for sultanate that I've seen before include "Country" , "Turkey was" , "Brunei?" , "Muslim dominion" .)