In Seoul Jay suffered dubiety (8)

I believe the answer is:

jealousy

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'dubiety' is the definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'in seoul jay suffered' is the wordplay.
'seoul jay' anagrams to 'JEALOUSY'.
However, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for jealousy that I've seen before include "Suspicious resentment" , "bad emotion" , "Form of resentment" , "Feeling of envy" , "It is called the green-eyed monster" .)

I've seen this clue in the Sydney Morning Herald.

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