"The King and I" locale (4)
I believe the answer is:
siam
'the king and i locale' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for siam that I've seen before include "Thailand's former name" , "The King and I nation" , "old part of East" , "old-style country" , "An old country" .)