Related Clues:

• It's a strain to do this
• Strain that's a trifle unexpected
• Aquarium water purifier
• Pass through a device to remove unwanted material
• Tap add-on
• Screen out unwanted material
• Paper in a coffeemaker
• Leak out document about Turkish leader to regiment
• Protection against lurid search content
• Strainer; a traffic light
• Abstain from food; not fading
• Porous strainer
• Purifier
• An unexpected trifle -- a riddle, perhaps
• Coffeemaker insert