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For example, copper kettle contains this (7)

Ross

I believe the answer is:

element

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'for example copper' is the definition.
(copper is a chemical element)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for element that I've seen before include "part of a toaster" , "Eg copper" , "Fire (or part of one)" , "that's used in heating" , "Fundamental component" .)

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