Crossword Genius

Spike for scaling (5)

Ross

I believe the answer is:

piton

(Other definitions for piton that I've seen before include "Spiked climbing aid" , "Kind of rope-supporting peg used in rock-climbing" , "It helps the climber" , "Peg driven into rock as climbing support" , "Mountaineering tool" .)

I've seen this clue in The Wall Street Journal.
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