Couple you might overhear from Bangkok? (4)

I believe the answer is:

thai

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'from bangkok?' is the definition.
(Bangkok is in Thailand)

I can't explain the remainder of the clue.

(Other definitions for thai that I've seen before include "East Asian" , "Sort of eastern cooking" , "Asian tongue" , "Easterner" , "Native of Southeast Asia" .)

I've seen this clue in The Times.

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