Crossword Genius

Traffic light; purifier (6)

Ross

I believe the answer is:

filter

(Other definitions for filter that I've seen before include "Screen out unwanted material" , "Device which allows fluids but not solids to pass through" , "Purifier" , "Strain" , "Device for straining impurities from liquid or gas" .)

I've seen this clue in The Times.
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