Crossword Genius

The one non-Sassenach in Berkshire? (5)

Ross

I believe the answer is:

ascot

I'm a little stuck... Click here to teach me more about this clue!

'in berkshire?' is the definition.
(I've seen this before)

'the one non-sassenach' is the wordplay.
'the one' becomes 'a' (a thing is one thing).
'non sassenach' becomes 'scot' (I can't justify this - if you can you should give a lot more credence to this answer).
'a'+'scot'='ASCOT'

Can you help me to learn more?

(Other definitions for ascot that I've seen before include "Royal race meeting venue" , "Necktie with wide square ends" , "Coats (anag) - racecourse" , "course without any fences!" , "Broad necktie" .)

I've seen this clue in the Evening Standard.
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