Worshippers beheaded Asian banker (5)

I believe the answer is:

indus

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'asian banker' is the definition.
(a river, ie something with 'banks')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for indus that I've seen before include "Main river of Pakistan" , "Great river of South Asia" , "River flowing from Tibet to the Arabian Sea" , "Constellation - Pakistan river" , "Long river of Asia" .)

I've seen this clue in The Sun.

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