The phrase "a sort of opaque" is correct and usable in written English.
It can be used to describe something that is somewhat unclear or difficult to understand, often in a metaphorical sense.
Example: "The explanation was a sort of opaque, leaving many questions unanswered."
Alternatives: "somewhat unclear" or "kind of murky".
Eastwood is, and always has been, a great sketch artist for whom brisk, stylized restraint — a sort of opaque tightness within a frame of breezy looseness — has always been second nature.
They glow not with faraway fires or any particular certitude, just a sort of opaque serenity, something that may at last have descended on a man no longer obligated to see past the fence.
Environmentalists tout a sort-of pagan eschatology.
At the moment it has large watercolor, dye and ink paintings on paper by Anke Weyer, a young German artist who studied with Per Kirkeby; they are sort of opaque, with figures of women floating up from under a welter of abstract strokes.
Paul Romer, an expert on economic growth, is out of his own project, tripped up by the sort of opaque decision making that his plan was supposed to change.
But now, Mr. Romer, an expert on economic growth, is out of his own project, tripped up by the sort of opaque decision making that his plan was supposed to change.
Should her advice be heeded, one can imagine a future in which the head of the justice department is installed through the same sort of opaque and unaccountable bureaucratic process that now selects most Canadian judges, public prosecutors and civil servants.
It doesn't treat the drivers of high costs as some sort of opaque mystery requiring the genius of Jeff Bezos, Warren Buffett and Jamie Dimon to unravel because they're not a mystery.
In a sort of alchemy, the light becomes solid and an opaque body becomes luminous as the same woman gives form to the different images.
It told the opaque but intriguing tale of four young scientists building a sort of time machine in a garage.
