Loutishness of baddy finally replacing initiator of heist (7)
I believe the answer is:
yobbery
'loutishness' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
(Other definitions for yobbery that I've seen before include "Loutishness" , "Beer-fuelled behaviour" , "Rude noisy behaviour" , "Loutish behaviour" , "antisocial behaviour" .)