Speleologist (8)

I think it could be either:

Which length description are you looking for?:

potholer

'speleologist' is the definition.
(synonyms)

This is all the clue.

(Other definitions for potholer that I've seen before include "Explorer of underground caves" , "Speleologist" , "Caver" .)

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

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