Bearing thanks, King George departed to tour Thailand (8)

I believe the answer is:

attitude

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'bearing' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

(Other definitions for attitude that I've seen before include "Opinion or position on something" , "Feeling, opinion or mood" , "Self-confident behaviour; way of thinking" , "Mental state; orientation" , "Settled way of thinking" .)

I've seen this clue in The Guardian.

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