The most common and most likely answer to this crossword clue is the 10 letter word WUNDERKIND
I've seen this crossword clue in The Guardian
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More clues leading to the result WUNDERKIND
- Less than a grand invested in current prodigy
- Precocious child supported by family in outskirts of Watford
- Very successful young person with sub-species?
- Young German master‘s last to kowtow to the bottom form
- Child sensation finding Andrew ultimately less than sympathetic
- Prodigy finding women less than generous
- Subordinate and king in turn getting early success
- Maybe Mozart‘s instruments — not as many as Köchel collected
- Brilliant child organised run with new kid and daughter
- Extraordinary issue, wife not generous enough, might I suggest?
Buddy explains!

The straight part
We know that "Maybe Mozart/Maybe Mozart" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case maybe mozart/maybe mozart = wunderkind.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does WUNDERKIND mean?
WUNDERKIND noun- A child prodigy; a phenom.
- A highly talented or gifted individual; one who is successful at a young age.