State of India could daunt mail sorting (5,4)

I believe the answer is:

tamil nadu

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'state of india' is the definition.
'Tamil Nadu' can be an answer for 'state' (Indian state). I am not certain of the 'of india' bit.

'daunt mail sorting' is the wordplay.
'sorting' indicates an anagram.
'daunt'+'mail'='dauntmail'
'dauntmail' with letters rearranged gives 'TAMIL NADU'.

'could' is the link.

Can you help me to learn more?

(Other definitions for tamil nadu that I've seen before include "Southern Indian state" , "Southern state of India" , "state bordering Kerala" .)

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

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