Vermin skulking about city (5)
I believe the answer is:
minsk
'city' is the definition.
(capital of Belarus)
'vermin skulking about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'MINSK' can be found hidden inside 'vermin skulking'.
(Other definitions for minsk that I've seen before include "Capital of 15" , "City of Belarus" , "capital city" , "Capital of Belarus" , "E European capital" .)