Guilty party working around bit of California (6)
I believe the answer is:
nocent
'guilty' is the definition.
(nocent means harmful)
'working around bit of california' is the wordplay.
'working' becomes 'on' (on can mean working or activated).
'around' is a reversal indicator.
'bit of california' becomes 'cent' (I can't explain this - if you can you should believe this answer much more).
'on' reversed gives 'no'.
'no'+'cent'='NOCENT'
'party' acts as a link.
Can you help me to learn more?
(Other definitions for nocent that I've seen before include "guilty person" , "Harmful" .)