Crossword Genius

Envelope specially prepared to contain ring and stones (6)

Ross

I believe the answer is:

stelae

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'stones' is the definition.
(stele is a kind of stone)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for stelae that I've seen before include "stones!" , "tablets" , "Upright commemorative stone slabs" .)

I've seen this clue in The Times.
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