As above, or figure out how to cloak for Adwords so you show Adwords reviewers and Adsbot a nice info page, and you redirect your real surfers to the CB sales page.
I tried to put an Adwords campaign together for a Clickbank product, but Google didn't let it run.
Can anyone suggest a way of getting around this at all?
You can't. You must follow all Adwords rules and guidelines, even if it's not your own site. Clickbank product pages don't follow these rules for the most part, especially the one about misleading and unrealistic claims. So choose carefully. Study the Adwords guidelines and study the offers you want to promote. If the page doesn't follow the rules, don't promote it.
The best thing would be cloacking,wich i don't have any idea how you could do it.
So you agree, at least at this time, that you can't get around it.
Cloaking what exactly? Do you know how Adwords works? Do you think Google hasn't thought about this before or that you can fool a bunch of smart people? They check these things. Besides, if the landing page does not conform to their policies, there's nothing you can do unless you make the page conform. I think it's you who don't know what you're talking about, respectfully.