Crossword Genius

Shape of the punster's departed parrot? (7)

Ross

I believe the answer is:

polygon

I'm a little stuck... Click here to teach me more about this clue!

'shape' is the definition.
(polygon is a kind of shape)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for polygon that I've seen before include "Straight-sided figure" , "Closed plane figure with three or more straight sides" , "Figure with many sides" , "Closed plane figure bounded by straight sides" , "Plane figure with a number of straight sides" .)

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