The phrase "a clever system" is correct and usable in written English.
You can use it to describe a system that is intelligent, innovative, or effective in solving problems or performing tasks.
Example: "The new software features a clever system that optimizes resource allocation and improves overall efficiency."
Alternatives: "an ingenious system" or "a smart system".
TED Fellow Pratik Shah is working on a clever system to do just that.
So we've devised a clever system to determine when to let a habit take over.
Using a clever system of awards for the homeowner (green "leaves" for doing the energy-efficient thing), the thermostat is intended to save money through efficiency.
The Israelis laboriously laid the foundations of the high-tech boom by pouring money into elite universities and creating a clever system to attract venture capital.
It's a clever system built into Microsoft's game console, designed to hook gamers by doling out bragging rights to dedicated players.
It has a clever system of file tabs that keep current news and information, not just links to current news and information, at your fingertips.
You get a world zone comparable to a seemingly sprawling location like the wasteland of Fallout 4. This fact was discovered by the ambitious YouTuber, MarcoStyle, who invented a rather clever system using the in-game maps of a few games to measure distance using GPS, the map and waypoints.
"Dieudonné has created a very clever system," says Rabbi Krygier, "He has singled out the Jews and made them a scapegoat.
Employs a very clever system of Velcro and buckles to remain very securely attached to your bike frame (as seen on the Raleigh in the main picture, above).
Dr. Montgomery called Dr. Rosgen's classification "a very clever system" but said it was wrong to think that "just by knowing what channel type you have you would know what to do".
Providing lots of nudge buttons and other input options – together with flashing lights and sound rewards for successful implementation – fools us into thinking we are skilled players rather than victims of a very clever system.
