Ravine originally accessed on ship (5)

I believe the answer is:

abyss

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'ravine' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

(Other definitions for abyss that I've seen before include "Bottomless gulf" , "Bottomless pit" , "Measureless chasm" , "Deep gulf" , "Deep pit" .)

I've seen this clue in The Times.

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