convoy (5)
I believe the answer is:
fleet
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">convoy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for fleet that I've seen before include "Swift; armada" , "Swift like navy" , "ships, lots of them" , "Group of ships, aircraft etc" , "Naval force or collection of buses" .)