Run past with energy (3)
I believe the answer is:
bye
'run' is the definition.
(type of cricket run)
'past with energy' is the wordplay.
'past' becomes 'by' (as in years gone by).
'with' is a charade indicator (letters next to each other).
'energy' becomes 'e' (physics symbol as in E=mcy).
'by'+'e'='BYE'
(Other definitions for bye that I've seen before include "Cricketing extra" , "See you" , "Cheerio" , "Get one to advance to the next round without playing an opponent" , "Extra run; farewell" .)