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The basic requirement for a live wire (7)

Ross

I believe the answer is:

element

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

I cannot understand how the remainder of the clue works.

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(Other definitions for element that I've seen before include "Primary chemical substance" , "Chemical building-block" , "Singular ingredient" , "Component - factor" , "Eg copper" .)

I've seen this clue in The Irish News.
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