A last tune composed in Oman, for example (9)
I believe the answer is:
sultanate
'oman for example' is the definition.
(I've seen this in another clue)
'a last tune composed' is the wordplay.
'composed' indicates anagramming the letters.
'a'+'last'+'tune'='alasttune'
'alasttune' is an anagram of 'SULTANATE'.
'in' acts as a link.
(Other definitions for sultanate that I've seen before include "Turkey was" , "Muslim dominion" , "Country" , "Brunei?" .)