One who stands on his own two feet (5)

I believe the answer is:

biped

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'one who stands on his own two feet' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

This is the entire clue.

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(Other definitions for biped that I've seen before include "Two-legged animal" , "One walking on two feet" , "One standing on two feet" , "Creature with two feet" , "Man, say" .)

I've seen this clue in The Irish Independent.

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