One who carries a dead weight (6)
I believe the answer is:
bearer
'one who carries' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for bearer that I've seen before include "Coffin carrier (one paid on demand?)" , "Carrier to whom cheque may be payable" , "One presenting cheque" , "One who helps to carry something - maybe news" , "One who puts up with" .)