Crossword Genius

Weird arachnid with venomous tail in the French cemetery (10)

Ross

I believe the answer is:

necropolis

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'cemetery' is the definition.
(synonyms)

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

Can you help me to learn more?

(Other definitions for necropolis that I've seen before include "Ripon Close (anag) - cemetery" , "Large ancient cemetery" , "burial site" .)

I've seen this clue in The Irish Times.
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