Possible Clues:

• Productive clip for Rocky covers second fight
• Intellectually productive
• Rich for life, practically -- I lead in commerce
• Plentiful, copious
• Very productive expert has most of career in charge
• Abundant crop, if spreading, smothers large island
• Rich for life with no European in charge
• Having high output for short duration — one critic's conclusion
• Bearing offspring in abundance
• Churning out book after book, say