New visitor mad on crime (7)
I believe the answer is:
incomer
'new visitor' is the definition.
'incomer' can be an answer for 'visitor' (thesaurus). I am not sure about the 'new' bit.
'mad on crime' is the wordplay.
'mad' indicates anagramming the letters.
'on'+'crime'='oncrime'
'oncrime' with letters rearranged gives 'INCOMER'.
Can you help me to learn more?
(Other definitions for incomer that I've seen before include "No native" , "New resident where he was not born" , "New arrival in an area" , "Perhaps asylum seeker" , "Recent arrival" .)