Passing, finished with theft (10)
I believe the answer is:
overtaking
'passing' is the definition.
(I know that passing can be written as overtaking)
'finished with theft' is the wordplay.
'finished' becomes 'over' (over can mean finished or ended).
'with' is a charade indicator (letters next to each other).
'theft' becomes 'taking' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'over'+'taking'='OVERTAKING'
Can you help me to learn more?
(Another definition for overtaking that I've seen is " Passing".)