Cop leaves secret police bewildered in county town (9)
I believe the answer is:
leicester
'county town' is the definition.
(I know that Leicester is a county town)
'cop leaves secret police bewildered' is the wordplay.
'leaves' suggests deleting specific letters.
'bewildered' indicates anagramming the letters.
'secret'+'police'='secretpolice'
'secretpolice' with 'cop' taken away is 'seretlice'.
'seretlice' is an anagram of 'LEICESTER'.
'in' acts as a link.
(Other definitions for leicester that I've seen before include "Orange kind of cheese" , "royal favourite" , "Elizabeth the first's favourite" , "Cheese; town" , "County town on the river Soar" .)