Group of ships (5)
I believe the answer is:
fleet
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">group of ships</span>' is the definition.<br/ ><span class="explanation-format__explanation">(eg a naval fleet)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for fleet that I've seen before include "Navy - quick" , "Swift - London street" , "Swift; armada" , "good turn of speed" , "What makes London underground journey" .)