Grotto (4)

I think it could be either:

Which length description are you looking for?:

cave

'grotto' is the definition.
(I know that cave is a type of grotto)

This is the entire clue.

(Other definitions for cave that I've seen before include "Hollow in a cliff or underground" , "Natural hollow in side of hill or cliff" , "Natural underground chamber" , "Watch out" , "Beware" .)

I've seen this clue in the Evening Standard, The Sunday Times, The Sun, The Mirror, The Times and The Telegraph.

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