Great deal (4)
(Other definitions for load that I've seen before include "Cargo - burden" , "Amount" , "pack" , "Weight, source of pressure" , "A heavy burden" .)
'great deal' is the definition.
(I know that great deal can be written as heap)
This is the entire clue.
(Other definitions for heap that I've seen before include "Mound, pile" , "Mound, stack" , "Mound - dilapidated vehicle" , "good deal" , "Unreliable old car" .)