Proper contest: student ousted (3)

I believe the answer is:

due

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'proper' is the definition.
(what is due is what is proper or appropriate)

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

Can you help me to learn more?

(Other definitions for due that I've seen before include "...more than one there [ROME]" , "Ripe for payment or arrival" , "Expected, scheduled" , "Expected at any moment" , "deserts" .)

I've seen this clue in The Sun.

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