Unloading site (4)
I believe the answer is:
pier
'unloading site' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pier that I've seen before include "Seaside structure" , "Breakwater; arch pillar" , "One jutting into sea" , "Surviving antiquity" , "Seaside attraction" .)