Gifted student appearing in a flash? (6,5)
I believe the answer is:
bright spark
'gifted student' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'appearing in a flash?' is the wordplay.
'appearing in' becomes 'bright' (I can't justify this - if you can you should give a lot more credence to this answer).
'a flash?' becomes 'spark' (spark is a kind of flash).
'bright'+'spark'='BRIGHT SPARK'
Can you help me to learn more?
(Other definitions for bright spark that I've seen before include "Lively and clever individual" , "ironically, one that's witty" , "Someone who appears (irritatingly?) clever" , "one who has many good ideas" , "Clever person" .)