The "clutch pedal" is a part of a car that you step on with your foot to change gears. When you press it, it disconnects the engine from the wheels temporarily, allowing you to switch gears smoothly. Full definition
For manual transmissions, the press clutch pedal light is just a reminder that the clutch needs to be pressed in before the engine can be started. (yourmechanic.com)
Hard launches are more or less out of the question, thanks largely to the lack of clutch pedal and launch control. (cnet.com)
A slightly depressed clutch pedal wears out your clutch faster and also reduces its efficiency. (carwale.com)