Kidnap quietly, criminal again found outside hotel (8)
I believe the answer is:
shanghai
'kidnap' is the definition.
(shanghaiing is a kind of kidnaping)
'quietly criminal again found outside hotel' is the wordplay.
'quietly' becomes 'sh'.
'criminal' indicates an anagram.
'found outside' indicates putting letters inside.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'again' with letters rearranged gives 'angai'.
'angai' going around 'h' is 'anghai'.
'sh'+'anghai'='SHANGHAI'
(Other definitions for shanghai that I've seen before include "It's wrong to gain hash in the Chinese city" , "How to impress a sailor" , "Abduct to serve as a sailor" , "Oddly, you can gain hash in the Chinese city" , "China's largest city" .)