There's many a girl in an English city (7)
I believe the answer is:
chester
'city' is the definition.
(Chester is an example)
'there's many a girl in an english' is the wordplay.
I cannot really see how this works, but
'many' could be 'c' (C is the Roman numeral for 100) and 'c' is located in the answer.
'girl' could be 'hester' and 'hester' is found within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for chester that I've seen before include "See 8" , "Tetchy cries (anag)" , "diocese" , "Walled UK city" , "Walled county town" .)