Crossword Genius

Copper's sphere of operation? (7)

Ross

I believe the answer is:

element

I believe this clue is a double definition.

'copper's' is the first definition.
(copper is a chemical element)

'sphere of operation?' is the second definition.

(Other definitions for element that I've seen before include "Basic substance or feature" , "Basic constituent; aspect" , "Constituent part (7)" , "eg Fire, air" , "An abstract part of something" .)

I've seen this clue in The Sun.
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