text: Top Cleric Looks to Broker Deal in Najaf NAJAF, Iraq - Iraq's most powerful Shiite cleric returned home from Britain on Wednesday to help broker an end to nearly three weeks of fighting in Najaf and is calling on his followers to join him in a march to reclaim the holy city, his spokesmen and witnesses said.    Grand Ayatollah Ali Husseini al-Sistani return came as heavy fighting persisted in Najaf's Old City...