Carrier (6)
I believe the answer is:
bearer
'carrier' is the definition.
(I know that carrier can be written as bearer)
This is all the clue.
(Other definitions for bearer that I've seen before include "native servant" , "Coffin carrier (one paid on demand?)" , "One who helps to carry something - maybe news" , "Messenger - coffin-carrier" , "Carrier to whom cheque may be payable" .)