Crossword Genius

the fifth element (5)

Ross

I believe the answer is:

'the fifth element' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for boron that I've seen before include "element needed for steel" , "Metalloid element, B" , "Non-metallic element, symbol B" , "component of steel" , "Chemical element, symbol B" .)

I've seen this clue in The New York Times.
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