Two bands taken up river (6)

I believe the answer is:

mersey

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'river' is the definition.
(English river)

I don't understand the remainder of the clue.

(Other definitions for mersey that I've seen before include "Route between Liverpool and the Wirral" , "Runcorn's river" , "River with ferry and tunnel" , "River rising in Derbyshire and flowing into the Irish Sea" , "River flowing into Liverpool Bay" .)

I've seen this clue in The Independent.

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