A British national racecourse (5)

I believe the answer is:

ascot

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

'a british national' is the wordplay.
'british national' becomes 'scot'.
'a'+'scot'='ASCOT'

(Other definitions for ascot that I've seen before include "Racing to the strange coast" , "English horse racing venue on coast" , "Racecourse near Windsor" , "somewhere in Berks" , "Society race meeting" .)

I've seen this clue in The Telegraph.

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