Crossword Genius

Hollow in the earth or a rock face (4)

Ross

I believe the answer is:

cave

(Other definitions for cave that I've seen before include "Troglodyte's home" , "Hollow in a cliff or underground" , "Natural underground space" , "Aladdin, Fingal, had one" , "Hollow - warning" .)

I've seen this clue in the Sydney Morning Herald.
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