Springiness (6)
I believe the answer is:
bounce
'springiness' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for bounce that I've seen before include "Move energetically; rebound" , "Rebound (like a cheque)" , "Of a cheque, send back as worthless" , "Spring back like a rubber ball" , "Rebound; self-confidence" .)