umm alarm clocks arent usually grounded so you may want to get an extension cord with a ground or make your own with a male plug and a length of 14/2 wire with ground (that is 14 gauge wire with 2 wires and ground wire, so 3 wires actualy but called 14/2)

unless your alarm clock has a ground wire in it then ignore what i said

Edit: actually sorry you probablky be good without ground i ran cfls without ground and no problems.. however if you have many of them together id recommend grounding