Everything puts off top slave (5)
I believe the answer is:
helot
'slave' is the definition.
(slave in ancient Sparta)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for helot that I've seen before include "Spartan slave" , "Serf of ancient Sparta" , "Spartan serf" , "Greek serf" , "downtrodden?" .)