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

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