Get hitched, we’re told, to a foreigner (4)

I believe the answer is:

thai

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'to a foreigner' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for thai that I've seen before include "Native to Phuket, for example" , "From Bangkok, for instance" , "is concerned with an eastern country" , "nationality" , "From old Siam?" .)

I've seen this clue in the Evening Standard.

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