Clutch is not easy to cut and a sound when is running

Don't know what you mean by "cut"?
If you mean does not disengage, then one would check if the adjustment was correct, either hydraulic or cable.
Noise is usually either the throwout bearing going bad if it is when you start pressing on the pedal, or the clutch slipping when it is under 2nd grear hard acceleration.

But whatever it is, sound is bad and don't drive it until fixed.
Adjustment is done by ensuring there is at least a half inch freeplay in the pedal, before there is any resistance.
Cables are adjusted at the firewall or clutch arm, and hydraulics usually adjust the pedal rod length.

Not easy to cut ???? Not sure what you mean by this, but imprezas are notorious for failing clutches......it is the weakest link unfortunately.....

Has the clutch been recently replaced ?????

How many miles are on the clock ???

What kind of noise are you hearing ???