Strainers (6)
I believe the answer is:
sieves
'strainers' is the definition.
(sieve is a kind of strainer)
This is the entire clue.
(Other definitions for sieves that I've seen before include "With which to sift" , "'Strainers, riddles (6)'" , "Passes through fine holes" , "Implements for straining" , "Perforated vessels" .)