Crossword Genius

Found mountain hollowed out by a jet of water (8)

Ross

I believe the answer is:

fountain

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'jet of water' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for fountain that I've seen before include "Give out" , "Artificially-produced jet of water" , "Artificial jet of water" , "Ornamental water feature" , "Ornamental water-jet" .)

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