Links with a space station (5)
I believe the answer is:
'links with a space station' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for docks that I've seen before include "Harbour" , "Cuts short; port features" , "Cuts short - coarse weeds" , "Trims (tail); arrives in port" , "Cuts short, curtails" .)