Crossword Genius

Impurity remover (6)

Ross

I believe the answer is:

filter

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impurity remover</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 filter that I've seen before include "Remover of impurities" , "Strain" , "Screen out unwanted material" , "Strainer; a traffic light" , "Porous strainer" .)

I've seen this clue in The Times.
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