Hey mate, your throwout bearing has become dry, or seized all together, this results in a high pitched squeal when releasing the clutch pedal out. Most commonly on early starts but can occur at any time.
Unfortunately there is no easy fix, its a box out job, and you mosewell replace your clutch while your at it (kinda pointless spending $400 in labour to replace a $25 part)
I have driven a car like that for a few months with intermittent throwout noise, although I don't recommend it, you can keep driving the car if funds are tight!
And when the time comes, shoot me a PM, I can hook you up with a Exedy clutch kit cheaper than any sponsor here on SAU!