Shortly one's told to dance, bursting with energy (8)
I believe the answer is:
anecdote
'shortly one's told' is the definition.
I can't judge whether this definition defines the answer.
'to dance bursting with energy' is the wordplay.
'bursting with' indicates an anagram.
'energy' becomes 'e' (physics symbol as in E=mc2).
'to'+'dance'='todance'
'todance' with its letters anagrammed with 'e' can make 'ANECDOTE'.
Can you help me to learn more?
(Other definitions for anecdote that I've seen before include "Brief tale" , "Yarn" , "A short interesting story, usually true" , "Short amusing tale" , "One acted (anag) - amusing reminiscence" .)