Criminals may get cleared by horsemen (6)
I believe the answer is:
fences
'criminals' is the definition.
(people who handle stolen goods)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for fences that I've seen before include "Avoids directly answering" , "Uses a foil" , "Enclosing barriers" , "Engages in swordplay or processes stolen goods" , "Barriers that enclose" .)