Visually blah (4)
I believe the answer is:
drab
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">visually blah</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 drab that I've seen before include "Drearily dull; slattern" , "Cheerless, colourless" , "Shabby; a slattern (arch.)" , "Lacklustre" , "Dull, uninteresting" .)