Sifting device (6)
(Other definitions for sieve that I've seen before include "Straining device" , "Utensil with meshed bottom" , "Utensil for straining or sifting food" , "Device for separating lumps" , "Screen, sift, strain" .)
(Other definitions for filter that I've seen before include "Remover of impurities" , "Purifier" , "Selective traffic light" , "Strainer; a traffic light" , "Pass through screen to remove impurities" .)