Look quickly (6)
I believe the answer is:
glance
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">look quickly</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 glance that I've seen before include "batsman's shot" , "fly off" , "Give a quick look" , "Take a brief or hurried look" , "Oblique impact" .)