The Deputy Prime Minister also admitted in a television interview that very few people care about the need to replace the Lords with an elected senate.
A report from MPs and peers on Monday is likely to recommend a referendum to win public backing for the plans. It will also raise concerns about the role of an elected second chamber, and whether it should have primacy over the views of the House of Commons.
The Joint Committee is expected to call for an 80 per cent elected chamber, where members serve non-renewable 15-year terms. They would get a salary of around £50,000, rather than the existing attendance allowances.
Senior Conservatives are planning to fight the plans, with several ministerial aides likely to risk being sacked by voting against them if they are put to a Commons vote.
Some Tories have suggested that they might back down if Prime Minister David Cameron and Mr Clegg agreed to put the plans to a referendum, as they did last summer on electoral reform.
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