Crossword Genius

Nuclear fuel (7)

Ross

I believe the answer is:

uranium

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

This is the entire clue.

(Other definitions for uranium that I've seen before include "Chemical element, source of nuclear energy" , "Radoactive element" , "Radioactive metal used as fuel in nuclear reactors" , "Mineral used in nuclear reactors" , "Radioactive element of atomic number 92" .)

I've seen this clue in The Guardian.
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