Filter out (6)
I believe the answer is:
strain
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">filter out</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for strain that I've seen before include "Music" , "Screen" , "Family - stress - air - force" , "Try too hard" , "Family - tension" .)