Removing the sediment from port (8)
I believe the answer is:
dredging
'removing' is the definition.
(dredging is a kind of removing)
'sediment from port' is the wordplay.
I cannot quite understand how this works, but
'from' could be 'in' (I've seen this in other clues) and 'in' is present in the answer.
This explanation may well be incorrect...
'the' is the link.
Can you help me to learn more?
(Other definitions for dredging that I've seen before include "Clear the bottom of a river by bringing up mud" , "Digging out harbour or waterway" .)