Longshoreman (6)
I believe the answer is:
docker
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">longshoreman</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for docker that I've seen before include "Stevedore" , "He loads and unloads ships" , "colleagues at the wharf?" , "One unloading" , "One who loads ships" .)