Piebald surprisingly walking upright (7)

I believe the answer is:

bipedal

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

'piebald surprisingly' is the wordplay.
'surprisingly' is an anagram indicator.
'piebald' is an anagram of 'BIPEDAL'.

Can you help me to learn more?

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

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