Smart one confused with a bird (8)
I believe the answer is:
'smart' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
'one confused with a bird' is the wordplay.
'confused with' is an anagram indicator.
'one' mixed up with 'abird' can make 'DEBONAIR'.
Can you help me to learn more?
(Other definitions for debonair that I've seen before include "The dashing", "Confident, stylish and charming", "Suave and urbane on air bed", "Carefree and elegant", "Bored Ian can have carefree appearance".)