Glance over quickly (4)
I believe the answer is:
scan
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">glance over 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 scan that I've seen before include "Peruse, scrutinise" , "short survey" , "Examine quickly" , "Examine data" , "Hercule ---, detective" .)