Athlete rappels backwards, gripping sharp mountain ridge (5)

I believe the answer is:

arete

I'm a little stuck... Click here to teach me more about this clue!

'sharp mountain ridge' is the definition.
(I've seen this before)

'athlete rappels backwards gripping' is the wordplay.
'ARETE' is hidden back-to-front within the letters.
However, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for arete that I've seen before include "feature of range" , "Glacial ridge" , "Sharp ridge on mountain, with a tree" , "Narrow mountain ridge - eater (anag)" , "part of mountain range" .)

I've seen this clue in The Hindu.

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