Cavernous (4)

I believe the answer is:

deep

'cavernous' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for deep that I've seen before include "Main" , "hard to follow" , "Profound - cunning - sea - bass" , "Cavernous" , "Extending far down" .)

I've seen this clue in the Newsday, the Newsday.com, The Times, the Wall Street Journal, The Chronicle of Higher Education and The Telegraph.

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