Cigarette part (6)

I believe the answer is:

filter

(Other definitions for filter that I've seen before include "Device for removing impurities by screening" , "Strainer; a traffic light" , "Device for straining impurities from liquid or gas" , "Device which allows fluids but not solids to pass through" , "Impurity remover" .)

I've seen this clue in the Evening Standard.

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