Criminals used by shepherds? (6)
I believe the answer is:
crooks
'criminals' is the definition.
(I know this)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for crooks that I've seen before include "at 16 down [MAN UNITED]" , "taken in hand by bishops" , "shepherds lay hold of" , "Bad guys" , "Cheats" .)