Think of the last word you see when you lose a video game. Next, the most common top level domain, then the plural of a tool no writer can live without, and last the past tense of eat. Fix em together; what do you get? A perfectionist’s worst habit.

I swore to shield your precious eye, to block the dust that dares to fly, but oops, I slipped! Now here I dwell, a tiny ninja causing hell. You blink, you tear, you curse my name. Yet with every flutter, I’m the same.

I have four eyes that you surely can't Miss. But take them away and I sound like a lisp.

I'm an infrequent flier, I whistle as I climb ever higher, Out of breath, in a shower I expire. Keep me clear of dry areas so I don't cause a fire.

To start I'm a villain with no meat on my head, part of inside you and look like I'm dead. To end just three letters, used to surf the dark web. A quick combination and the answer is said.