Crossword Genius

Proper contest ended early (3)

Ross

I believe the answer is:

due

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'proper' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for due that I've seen before include "Deserved or unpaid" , "Expected; appropriate" , "Owed, or payable immediately" , "Expected; proper" , "Expected, scheduled" .)

I've seen this clue in The Sun.
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