Devious con urges bum (8)
I believe the answer is:
scrounge
'bum' is the definition.
(I've seen this before)
'devious con urges' is the wordplay.
'devious' indicates an anagram.
'con'+'urges'='conurges'
'conurges' anagrammed gives 'SCROUNGE'.
(Other definitions for scrounge that I've seen before include "Seek something free from others" , "Cadge, sponge" , "Cur's gone (anag) - beg" , "Obtain (something) for free" , "Acquire by begging" .)