"The King and I" country (4)

I believe the answer is:

siam

'the king and i country' 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 "Old Thailand" , "Thailand, formerly" , "An old country" , "Former name of Thailand" , "old-style country" .)

I've seen this clue in the Universal and the Jonesin Crosswords.

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