A metal spike be driven into a crevice of rock or into ice and used to secure a ropein mountaineering (5)

I believe the answer is:

piton

(Other definitions for piton that I've seen before include "Climber's spike" , "Climber's iron peg" , "Peg driven into rock to aid climbing" , "Mountaineer's metal spike" , "Peg used in mountaineering" .)

I've seen this clue in The Independent.

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