Crossword Genius

Rock climber's challenge

Ross

I believe the answer is:

cliff

'rock climber's challenge' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for cliff that I've seen before include "Precipice" , "High, steep rock face" , "A sheer rock face, in mountain or by sea" , "stony face?" , "Steep high rockface" .)

I've seen this clue in The Mirror.
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