Start school dropping every second set of courses (8)

I believe the answer is:

luncheon

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'set of courses' is the definition.
(luncheon is a type of meal)

I don't understand the rest of the clue.

(Other definitions for luncheon that I've seen before include "formal occasion" , "Midday meal" , "fare at one?" , "midday menu" , "part of formal board" .)

I've seen this clue in The Telegraph.

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