Asian I follow occasionally in Tehran (4)

I believe the answer is:

thai

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'asian' is the definition.
(from Thailand)

I can't explain the rest of the clue.

(Other definitions for thai that I've seen before include "From Bangkok, for instance" , "Morte d'16author" , "Someone from Bangkok, perhaps" , "Sort of eastern cooking" , "Native of Southeast Asia" .)

I've seen this clue in The Irish Times.

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