Tubeless Tyres -"saying the same things about tubeless tyres over and over again" Hippy read the first f**king post

can I just chuck a clincher and tube on

No. Tubeless is not the same as tubular. Ambrosio Cronos are tubular rims and can't be used with clincher tyres. It's not so much that they'll pop off - more that you won't be able to fit a clincher tyre to a tubular rim in the first place.

P. S. Wrong thread - you need this one for tubular tyres and rims.