Crossword Genius

Alien mineral that could threaten hero, seen beneath church this evening, reportedly (10)

Ross

I believe the answer is:

kryptonite

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for kryptonite that I've seen before include "threat to Kent" , "Mineral avoided by Superman" .)

I've seen this clue in The Irish Times.
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