Crossword Genius

Oddly indigenous ones avoided underground cells (8)

Ross

I believe the answer is:

dungeons

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

'underground cells' is the definition.

'oddly indigenous ones avoided' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'ones' is 'eons' which is within the answer.
The remaining letters 'dung' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for dungeons that I've seen before include "Underground prisons" , "Underground prison cells" , "Underground cells for prisoners" .)

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