It's deep in old Ethiopia (5)

I believe the answer is:

abyss

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'it's deep' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

(Other definitions for abyss that I've seen before include "something rather deep" , "Deep gulf" , "canyon?" , "great depth" , "Seemingly bottomless chasm" .)

I've seen this clue in the Evening Standard.

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