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

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