Crossword Genius

Stone making them stay (8)

Ross

I believe the answer is:

amethyst

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

'making them stay' is the wordplay.
'making' indicates anagramming the letters.
'them'+'stay'='themstay'
'themstay' anagrammed gives 'AMETHYST'.

(Other definitions for amethyst that I've seen before include "Transparent bluish quartz" , "Purple quartz, used as a gemstone" , "Something precious" , "Violet-coloured stone" , "Purple quartz used in jewellery" .)

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