Solving all the other clues I have QEV for the unit of energy but I can't find it anywhere. I think it might be something to do with electrical energy (Volt). It isn't called smallest hardest for nothing!
...Kiloelectronvolt might work. if an alternative spelling of whatever the word with a Q in it used a K? http://www.thefreedictionary.com/kiloelectron+volt
maybe grasping at straws here!