Get access to a high lvl druid from a guildie or friend. Cast highest lvl DS's on druid:
10-22 ~ Go to Paludal run around the camps with druid aggroing mobs. Have the cleric cast a nuke on each mob, you have to do at least 1 pt of damage or no xp. This becomes much easier when you get your first AE.
22-35 ~ Go to Tower of Frozen Shadow, Second Floor Library. Again have druid pull the entire library back to the entrance. Pull to cleric and have cleric chain AE's. AE snare is useful on the druid if it does no damage. Be sure to heal the cleric as AE's will definitely get him aggro.
35-47 ~ Go to City of Mist. Have druid cast DS's on the zerker. Pull a lot of mobs back to zone and do the AE thing with cleric. CoM mobs can be a little much for the druid so why I recommend using zerker.
At 47, the Cleric can group with shammy/zerker, from then on you're golden...
My buddy and I did this and had a lvl 55 cleric with less than 24 hours playtime in about a week of only PLing a few hours a night.