Someone attempting to start off unloading goods (5)
I believe the answer is:
trier
'someone attempting' is the definition.
(someone attempting to do something)
'start off unloading goods' is the wordplay.
'start off' becomes 'trigger' (trigger can mean to start off or initiate).
'unloading' suggests deleting specific letters.
'goods' becomes 'gg' (an abbreviation for good written twice).
'trigger' with 'gg' taken out is 'TRIER'.
'to' is the link.
(Other definitions for trier that I've seen before include "Person attempting" , "One who doesn't give up - judge?" , "town in Germany" , "One persevering" , "One who perseveres" .)