The term 'USE A SIEVE' is a common phrase used to describe the process of separating out smaller particles from larger ones. This process can be accomplished by using a sieve, which is a device with small holes in it that allows smaller particles to pass through while blocking larger ones. The crossword solutions for this term are SIFT (4 letters), SIFTS (5 letters), and STRAIN (6 letters). SIFT is a verb meaning to separate out the finer particles from the coarser ones. SIFTS is the third-person singular present tense of the verb, and STRAIN is a noun referring to the act of filtering or sifting.