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 Universal, The Wall Street Journal, the Penny Press, The Mirror, the USA Today, the Newsday, The Telegraph, the LA Times, The New York Times and The Guardian.

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