Crossword Genius

Bumptious parrot (5)

Ross

I believe the answer is:

cocky

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'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" .)

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