Crossword Genius

Moves higher, having a hundred legs (6)

Ross

I believe the answer is:

climbs

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

'moves' is the definition.
(climbing is a kind of moving)

'higher having a hundred legs' is the wordplay.
I cannot really understand how this works, but
'hundred' could be 'c' (Roman numeral) and 'c' is located in the answer.
The remaining letters 'limbs' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for climbs that I've seen before include "Scales" , "Ascends, mounts" , "Moves upward gradually" , "Moves upward slowly" , "Goes up" .)

I've seen this clue in the Sydney Morning Herald.
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