Royal meeting a highlander (5)

I believe the answer is:

ascot

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

'a highlander' is the wordplay.
'highlander' becomes 'scot'.
'a'+'scot'='ASCOT'

(Other definitions for ascot that I've seen before include "prestigious meeting" , "Berkshire racecourse - coast (anag)" , "Posh racecourse" , "Racecourse and cravat" , "Royal race course" .)

I've seen this clue in The Telegraph.

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