Possible Clues:

• Serious-sounding name
• First name of a literary 'Papa'
• He is unusually tense about mid-afternoon
• Chemistry Nobelist Rutherford
• Swiss conductor Ansermet
• Man displays hesitation over retreat
• Literature's Papa
• Does he sound like an important, wild being?
• Chap dramatically making serious pronouncement
• First name of ''The Texas Troubadour''