Slight coloration (4)
I believe the answer is:
tint
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">slight coloration</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 tint that I've seen before include "A slighth shade of colour" , "Hair dye" , "Quality of colour" , "Shade; colour slightly" , "Hue, shade" .)