Countryman rejected home at deer park, originally (9)
I believe the answer is:
pakistani
'deer park originally' is the definition.
I can't judge whether this defines the answer.
'countryman rejected home at' is the wordplay.
'countryman' becomes 'pakis' (I can't explain this - if you can you should believe this answer much more).
'rejected' shows that the letters should be reversed in order.
'home' becomes 'in' ('he's home' can mean 'he's in').
'in'+'at'='inat'
'inat' in reverse letter order is 'tani'.
'pakis'+'tani'='PAKISTANI'
Can you help me to learn more?
(Other definitions for pakistani that I've seen before include "Asian" , "foreigner" , "E.g. someone from Islamabad" , "National" , "Nationality of citizen of Islamabad" .)