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

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