Piebald horses around, regarding human (7)

I believe the answer is:

bipedal

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'regarding human' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'piebald horses around' is the wordplay.
'horses around' indicates anagramming the letters.
'piebald' with letters rearranged gives 'BIPEDAL'.

Can you help me to learn more?

(Other definitions for bipedal that I've seen before include "Walking on two feet" , "Two-footed" , "Like human" .)

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

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