'Leaving Clegg in charge' is a phrase that refers to something that seems like a good idea at the time but ultimately ends in chaos, usually referring to leaving someone in charge who is an incompetent idiot.
David: hmm I feel like a very expensive holiday to Italy, Nick you're in charge for the week.
Nick: Oh thank you David, I won't let you down.
*Comes back a week later to riots and madness*
Boris: That's what we get for Leaving Clegg in charge.