Mesh strainer (5)
I believe the answer is:
sieve
'mesh strainer' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sieve that I've seen before include "Eratosthenes' invention" , "Craft for Jumblies" , "Mesh used for straining or sifting" , "Kitchen strainer" , "Fine strainer" .)