Crossword Genius

Area Siam's part of? (4)

Ross

I believe the answer is:

asia

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'of?' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'area siam's part' is the wordplay.
'part' indicates a hidden word.
'ASIA' can be found hidden inside 'area siam'.

Can you help me to learn more?

(Other definitions for asia that I've seen before include "Continental land mass" , "A great deal of land" , "Populous continent" , "Populous area" , "The Orient" .)

I've seen this clue in The Telegraph.
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