Possible Clues:

• Child prodigy
• Wife perhaps not tolerant enough to see brilliant child?
• Young German master's last to kowtow to the bottom form
• Young sensation (German)
• Extraordinary issue, wife not generous enough, might I suggest?
• Bridge player less than generous with child prodigy
• Child prodigy was initially at the bottom of the class!
• Where Mozart's works might be filed in turn, as child prodigy
• Prodigious character of Mann
• One having early success serving king in trade?