Crossword Genius

Rock fissure (4)

Ross

I believe the answer is:

crag

(Other definitions for crag that I've seen before include "Steep, rugged peak" , "Steep or rugged cliff face" , "Rough, steep rock face" , "Steep rugged rock or cliff" , "Steep rock, peak" .)

I've seen this clue in The Guardian, the King Feature Syndicate, the L.A. Times Daily and The Sun.
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