Possible Clues:

• Poetic Indian greeting, a prelude to activity - what's funny in that?
• Longfellow's Onondaga Indian
• The long fellow made him start to sound even longer
• Native American hero of poem
• Indian hero of Longfellow's poem 'The Song of ... '
• Indian chief we hear is more senior — what a change!
• Indian chief
• Co-founder of the Iroquois Confederacy
• Longfellow's 19th-century Native American chief
• Husband of Minnehaha in a Longfellow poem