Don't mean to sound flippant, but mine does this when it's catching the edge of the blasted floor mat. Really annoying!
By the way, is your clutch very heavy? I went to inspect a V6 GTV for the first time recently and was taken aback by the weight and feel of the pedal - required real beef and felt as though it was fighting back!
a mechanic in the family changed the slave cylinder, made no difference, he referred to an non alfa clutch and gearbox specialist who has said that he's 99% sure its the flywheel, they change the clutch at the same time
the flywheel is a dealer only part at about £400+vat, total he wants is £850+ vat for the lot full clutch and flywheel
I'm puzzled too, 'clicking' seems most likely to be a problem developing in the pressure plate or the operating mechanism - but I'm not familiar with the flywheel. Why should a V6 need a dual mass flywheel, ain't it smoothe enough already?
Are you sure you need the flywheel done? Take it to a local independant specialist. My clutch is very heavy, and I sometimes get the "click" feeling - been told it's the release bearing on the clutch. New clutch - £400. Much less than £1000....