Possible Clues:

• One leads Muslims at mosque, primarily
• Mosque title
• Small measure to rein in a cleric
• Community and worship leader in Sunni Islam
• Title for Iran's Ruhollah Khomeini
• Church:priest::mosque:___
• ___ Reza shrine (Iranian holy site)
• Spiritual leader, one with mother in Newcastle, perhaps
• Religious leader usually sporting a beard
• Yours truly is a leader in mosque!