Crossword Genius

U (7)

Ross

I believe the answer is:

uranium

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">u</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for uranium that I've seen before include "Source of power" , "Radioactive element used for nuclear energy" , "Fissile element" , "Mineral used in nuclear reactors" , "Chemical element used to get nuclear energy" .)

I've seen this clue in The Guardian.
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