A UK resident popular with Arabians, of course
I believe the answer is:
ascot
'course' is the definition.
(I've seen this before)
'a uk resident' is the wordplay.
'uk resident' becomes 'scot' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'scot'='ASCOT'
'popular with arabians of' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for ascot that I've seen before include "Necktie with wide square ends" , "Berks racecourse" , "racing centre" , "course without any fences!" , "Racecourse, home to the Gold Cup since 1807" .)