Business suit shade (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">business suit shade</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for navy that I've seen before include "Senior service" , "Dark shade of blue" , "Armed force" , "Shade of the marine forces" , "Colour; fighting force" .)