Oriental of earnest disposition (7)

I believe the answer is:

eastern

'oriental' is the definition.
(synonyms)

'earnest disposition' is the wordplay.
'disposition' indicates an anagram.
'earnest' is an anagram of 'EASTERN'.

'of' is the link.

(Other definitions for eastern that I've seen before include "From Japan, say" , "Nearest (anag) - oriental" , "towards daybreak?" , "Asian" , "See 11" .)

I've seen this clue in The Globe and Mail.

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