Bottomless pit (5)

I think it could be either:

abyss

abysm

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

This is the entire clue.

(Other definitions for abyss that I've seen before include "something rather deep" , "crevasse" , "canyon?" , "Deep pit" , "Deep hole, seems bottomless" .)

I've seen this clue in the USA Today, the Universal, The Telegraph, the Newsday, the Penny Press, The New York Times, The Wall Street Journal, The Guardian, the LA Times and The Mirror.

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