Nonindustrial stretch of the river (5)

I believe the answer is:

indus

I'm a little stuck... Click here to teach me more about this clue!

'river' is the definition.
(Indian river)

'nonindustrial stretch of' is the wordplay.
'INDUS' is hidden in amongst the letters.
However, I'm uncertain how the hidden word is indicated.

'the' is the link.

Can you help me to learn more?

(Other definitions for indus that I've seen before include "9 of Pakistan" , "Punjab river" , "River rising in Tibet" , "banker" , "River of India and Pakistan" .)

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

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