Back to find English record dismissed in quiet part of America (4,5)
I believe the answer is:
deep south
'part of america' is the definition.
('Deep South' is part of 'america')
'back to find english record dismissed in quiet' is the wordplay.
'back to' indicates one should take the final letters.
'english' becomes 'E' (abbreviation).
'record' becomes 'EP' (abbreviation for extended play record).
'dismissed in quiet' becomes 'south' (I can't justify this - if you can you should believe this answer much more).
The last letter of 'find' is 'd'.
'd'+'e'+'ep'+'south'='DEEP SOUTH'
Can you help me to learn more?
(Other definitions for deep south that I've seen before include "Region including Alabama, Georgia, Louisiana" , "part of America" , "part of US" .)