Usually any noise like that - that goes away when you press in the clutch is a good indication that it's the throwout bearing. But if it happens only in the morning and not through out the day it can be something else. I cannot really help you though without a better description of the noise. Have you popped the hood right after starting it to see where the noise might be coming from?
1990 Ford Probe LX 3.0L V6 :s6:
SEE IT HERE:
1989 Mazda RX-7 Turbo II 13B-T "FC3S"
Turbo RWD Rotary Powa!