Stolen -- thanks man! (5)
I believe the answer is:
taken
'stolen' is the definition.
('taken' can be similar in meaning to 'stolen')
'thanks man' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'man' becomes 'ken' (**).
'ta'+'ken'='TAKEN'
(Other definitions for taken that I've seen before include "Removed, accepted" , "Obtained" , "Removed (from a place)" , "Appropriated" , "Removed; occupied" .)