Crossword Genius

Impurity remover (6)

Ross

I believe the answer is:

filter

'impurity remover' is the definition.
(I've seen this before)

This is the entire clue.

(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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