Noisy thief (7)
I believe the answer is:
rustler
'thief' is the definition.
(I know that rustler is a type of thief)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for rustler that I've seen before include "Stock taker?" , "Cattle-thief" , "Horse thief" , "lawbreaker" , "person taking stock" .)