I didn't see it, and can't access it either.
Possibly it's not supposed to be Clegg, but someone impersonating him by carrying a yellow briefcase, and hoping to get away with it by wearing a Burqa.
Obviously referencing the current court case where the defendent believed they should be able to hide their face.
The secondary (political) reference is lost on me. Could the face actually be some Tory backbencher who has got a better chance of getting in to see David Cameron if he poses as Clegg?