Crossword Genius

Separate clue for trifle? (6,3)

Ross

I believe the answer is:

filter out

I'm a little stuck... Click here to teach me more about this clue!

'separate' is the definition.
(filtering out is a kind of separating)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for filter out that I've seen before include "Use technique to remove muck" , "clear" .)

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