Musical state (8)
I believe the answer is:
oklahoma
I believe this clue is a double definition.
'musical' is the first definition.
(I've seen this before)
'state' is the second definition.
(Oklahoma is an example)
(Other definitions for oklahoma that I've seen before include "S. central US state" , "US State and musical drama" , "US state, joined in 1907" , "A holm oak for a musical" , "Look, a ham from the state" .)