Frantic Argonauts carrying load (5)
I believe the answer is:
cargo
'load' is the definition.
(I know that load can be written as Cargo)
'frantic argonauts carrying' is the wordplay.
'carrying' indicates the answer is hidden within the clue.
'CARGO' is hidden in the letters of 'frantic argonauts'.
(Other definitions for cargo that I've seen before include "What gets carried" , "Freight of ship, plane or truck" , "Payload" , "Consignment" , "Freight, load" .)