well if it only happens when you press the pedal down, it may be your TO bearing. now a bad TO bearing would usually make a hissing/grinding noise, just like any other bearing. you say you have a clicking sound, maybe it has somethin to do with the clutch fork being loose? either way, youll have to get inside the bellhousing to figure it out.
oh yea and check if it makes that sound in neutral and other gears because thatll help diagnose the problem