Crossword Genius

Stone made out of worms (9)

Ross

I believe the answer is:

nematodes

'worms' is the definition.
(nematode is a kind of worm)

'stone made out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'stone'+'made'='stonemade'
'stonemade' is an anagram of 'NEMATODES'.

'of' is the link.

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