Dark colour (5)
(Other definitions for black that I've seen before include "Gloomy" , "bar" , "Sort of guard, panther, jack or pudding..." , "Boycott" , "Very darkest colour" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dark colour</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for navy blue that I've seen before include "RN uniform colour" , "Colour of RN dress" , "Colour shade - a bun levy (anag)" , "Colour darker than royal" , "Senior Service shade" .)