Crossword Genius

Ascends, not using front legs, say (5)

Ross

I believe the answer is:

limbs

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'legs say' is the definition.
(leg is a kind of limb)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for limbs that I've seen before include "legs, perhaps" , "Arms and legs" .)

I've seen this clue in The Mirror.
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