Renewed energy (6,4)
I believe the answer is:
second wind
'renewed energy' is the definition.
(second wind can mean renewed energy or strength)
This is the entire clue.
(Other definitions for second wind that I've seen before include "playing perhaps but not from top brass" , "Distance runners need to get it" , "burst of renewed energy" , "Renewed energy in effort" , "Renewed energy to carry on" .)