Crossword Genius

Beware! Large hole underground (4)

Ross

I believe the answer is:

cave

This clue is a double definition.

'beware' is the first definition.
(old-fashioned term meaning 'look out')

'large hole underground' is the second definition.

(Other definitions for cave that I've seen before include "Natural subterranean opening" , "Large grotto" , "Underground enclosure with surface access" , "Beware" , "Hollow in a rock" .)

I've seen this clue in The Times.
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