Crossword Genius

A northerner, of course (5)

Ross

I believe the answer is:

ascot

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

'a northerner' is the wordplay.
'northerner' becomes 'scot' (someone from Scotland).
'a'+'scot'='ASCOT'

'of' is the link.

(Other definitions for ascot that I've seen before include "Famous racecourse" , "Fungus affecting wood" , "Royal race course" , "Racecourse with royal associations" , "Posh racecourse" .)

I've seen this clue in The Guardian.
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