In an interview with the Independent he also said that he hoped Gordon Brown would "steal" the idea so that the next election can have all-party agreement on the matter.
However, he went on to describe Brown as "the ultimate autocrat," and that "[i]f you think Blair is a control freak, wait until you see Brown", so his hope is obviously quite thin that Brown will steal the plans.
The plans include an end to the Royal Prerogative on declaring war, along with taking the control of the ministerial code of conduct out of the supervision of the Prime Minister and instead handing it over to a committee of MPs who could publicly criticise the PM if rules were breached.
The Indy has more details about the proposal here most of which seem pretty much common sense. The most significant move is the proposal to halve the number of special advisers in the different department in an attempt to de-politicise the Civil Service.
Clarke decision to effectively dare Brown into accepting the proposals and stealing them is an effective move. After all, if he rejects them all he will be effectively showing his contempt for democratising a broken system and so give even more weight to view that he's a complete control freak.