Take a brief light sleep (6)
I believe the answer is:
snooze
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">take a brief light sleep</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for snooze that I've seen before include "Catnap" , "Take a nap" , "Sleep lightly" , "An informal nap" , "Take a brief light sleep" .)