Hair highlight (6)
I believe the answer is:
streak
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hair highlight</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 streak that I've seen before include "Band of colour - run naked" , "Run naked in a public place" , "Go faster" , "act that may offend some spectators?" , "Run naughtily nude in public" .)