Crossword Genius

Adoptee supposedly lucky to miss first course (5)

Ross

I believe the answer is:

ascot

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'course' is the definition.
(Ascot is a racecourse)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for ascot that I've seen before include "Where the Queen often sees racehorses" , "Racing to the strange coast" , "track" , "prestigious meeting" , "English racecourse in Berkshire" .)

I've seen this clue in The Independent.
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