Screen out unwanted material (6)

I believe the answer is:

filter

'screen out unwanted material' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for filter that I've seen before include "Screen out unwanted material" , "Strain" , "Device to abstract solid matter" , "Sieve" , "Percolate" .)

I've seen this clue in The Irish Times and the Irish Times (Simplex).

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