Clutch: Mechanical friction device that engages or disengages the engine from the transmission.
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It is located between the engine and the gearbox. It is used to disengage the engine, which prevents the movement to be transmitted to the gearbox while the gear shifts are made. Roughly speaking, it is the piece that disengages the engine from the wheels when the driver presses on the clutch pedal.
As I drive and accelerate at higher RPM the engine revs up as if the clutch is in and doesn’t accelerate. Car will accelerate and increase speed at around 2000RPM however. Cruise control also doesn’t switch on since this issue started.