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Superseded weight and cash (6)

Ross

I believe the answer is:

pounds

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'cash' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for pounds that I've seen before include "UK monetary units" , "Sterling units of money or weights" , "Strikes; money" , "Crushes or beats with repeated blows" , "Hammers" .)

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