Pakistan's longest river (5)

I believe the answer is:

indus

'pakistan's longest river' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for indus that I've seen before include "Largest river of Pakistan" , "running water" , "River of India and Pakistan" , "Pakistani river" , "River of Southern Asia" .)

I've seen this clue in The Sunday Times and The Independent.

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