Springing back from a hard surface (8)
I believe the answer is:
bouncing
'springing back from a hard surface' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for bouncing that I've seen before include "Energetic - hearty..." , "Springing back from a hard surface" , "Big and healthy (baby)" , "(Of a baby) vigorous and healthy" .)