Wicked deeds at or around large towns (10)
I believe the answer is:
atrocities
'wicked deeds' is the definition.
'at or around large towns' is the wordplay.
'around' says the letters should be written in reverse.
'large towns' becomes 'cities'.
'or' written backwards gives 'ro'.
'at'+'ro'+'cities'='ATROCITIES'
(Other definitions for atrocities that I've seen before include "Awful acts" , "barbarous acts" .)