Crossword Genius

Beware a hollow space! (4)

Ross

I believe the answer is:

cave

I believe this is a double definition.

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

'a hollow space' is the second definition.
(underground space)

(Other definitions for cave that I've seen before include "Watch out" , "Warning - grotto" , "hole" , "Natural subterranean opening" , "Underground enclosure with surface access" .)

I've seen this clue in The Times.
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