Maritime force (4)
I believe the answer is:
navy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">maritime force</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for navy that I've seen before include "Ships-of-war" , "Fleet of ships" , "Senior service" , "Marine force" , "Colour of the fleet" .)