Crossword Genius

Weird mineral reduced in mass (4)

Ross

I believe the answer is:

eery

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

I cannot understand how the rest of the clue works.

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(Other definitions for eery that I've seen before include "Spooky" , "Weird" , "Weirdly frightening" , "Strange" , "Strangely frightening" .)

I've seen this clue in The Independent.
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