Crossword Genius

In Siberia, by small crevasse (5)

Ross

I believe the answer is:

abysm

'crevasse' is the definition.
(thesaurus)

'in siberia by small' is the wordplay.
'in' indicates a hidden word.
'ABYSM' is hidden in the letters of 'siberia by small'.

(Other definitions for abysm that I've seen before include "Deep hole" , "Bottomless pit" , "Deep cavity (arch)" , "Hell" , "Gorge" .)

I've seen this clue in The Guardian.
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