Filter, sieve (4)
I believe the answer is:
sift
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">filter</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">sieve</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that sieve can be written as sift)</span><br/ ><br/ ></span>
(Other definitions for sift that I've seen before include "Sieve, examine closely" , "Distinguish as with a riddle" , "Examine (eg evidence) discriminatingly" , "Pass though a sieve" , "Make fist of filter" .)