Dingy (4)
I believe the answer is:
drab
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dingy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(both can mean gloomy or dark)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for drab that I've seen before include "Dull-brown" , "Of a dull greenish-brown colour" , "Dull and monotonous" , "Colourless kind of bard" , "Shabby; a slattern (arch.)" .)