Most people think cleans are explosive because they are "fast". You can virtually make any lift explosize by using 50-60 % of your max and a variation of the exercize. For example, I want to be more explosive in the lower body,so I do jump squats.
Most people are anterior dominant, and all GREAT athletes are posterior dominant. A poor clean form just worsens the imbalances:
http://www.youtube.com/watch?v...qJU4&feature=related
Focus on the hips (money in baseball) and not the bar in this lift. Any explosiveness left?