Crossword Genius

Among some of the Byzantine, last icons are set in stone (9)

Ross

I believe the answer is:

inelastic

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'set in stone' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I don't see?

'among some of the byzantine last icons' is the wordplay.
'INELASTIC' is hidden in amongst the letters.
But, I am not sure how the hidden word is indicated.

'are' is the link.

Can you help me to learn more?

(Other definitions for inelastic that I've seen before include "Not giving" , "Lacking spring" , "Broken" , "Firm, not springy" , "without resilience" .)

I've seen this clue in the Sydney Morning Herald.
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