Climbs, as a rock wall (6)

I believe the answer is:

scales

(Other definitions for scales that I've seen before include "Fish flakes or measuring devices" , "Set of balances" , "They're found on fish" , "Libra, Sign of the Zodiac" , "7 [SIGN OF THE ZODIAC] representative" .)

I've seen this clue in the LA Times.

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