Bumptious parrot (5)
I believe the answer is:
cocky
'bumptious' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cocky that I've seen before include "Swaggering" , "Overly self-confident" , "Boldly self-confident" , "Cheekily confident" , "Cheekily self-assured" .)