The most common and most likely answer to this crossword clue is the 10 letter word BRILLIANCE
I've seen this crossword clue in Independent
B
R
I
L
L
I
A
N
C
E
Buddy explains!

The straight part
We know that "Exceptional talent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case exceptional talent = brilliance.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 BRILLIANCE mean?
BRILLIANCE noun- The quality of being exceptionally effulgent (giving off light).
- The quality of having extraordinary mental capacity.
- Magnificence; resplendence.