Crossword Genius

Tailless lizard climbing around earth cavity (6)

Ross

I believe the answer is:

coelom

I'm a little stuck... Click here to teach me more about this clue!

'cavity' is the definition.
(I know that coelom is a type of cavity)

I can't explain the remainder of the clue.

Can you help me to learn more?

I've seen this clue in The Times and The Sunday Times.
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