snooker clause
 n.— «It is called a “snooker clause” in legislative parlance—a last-minute insert into a dense and hurried midnight bill that, if ever disclosed after passage, always leaves legislators shocked, shocked at how such an undemocratic bit of mischief ever came to be.» —“Snookering the Taxpayers” New York Times Nov. 24, 2004. (source: Double-Tongued Dictionary)