Use a sieve (6)
I believe the answer is:
strain
'use a sieve' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for strain that I've seen before include "Put through a perforated device to separate" , "Race" , "Stretch or exert to the utmost" , "tax" , "Strive; ancestry" .)