Crossword Genius

Possible ingredient of game pie, endlessly cooked (6)

Ross

I believe the answer is:

magpie

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

'possible ingredient' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'game pie endlessly cooked' is the wordplay.
'endlessly' means to remove the last letter.
'cooked' indicates an anagram (letters cooked into a new form).
'game'+'pie'='gamepie'
'gamepie' with its final letter taken off is 'gamepi'.
'gamepi' with letters rearranged gives 'MAGPIE'.

'of' is the link.

Can you help me to learn more?

(Other definitions for magpie that I've seen before include "chatterer" , "A black-and-white thieving bird" , "Bird - obsessive collector" , "One on target" , "Half of 1D [GAME OR BIRD]" .)

I've seen this clue in The Telegraph.
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