Flexible, springy (7)
I believe the answer is:
elastic
I believe this is a double definition.
'flexible' is the first definition.
(I know that flexible can be written as elastic)
'springy' is the second definition.
(similar in meaning)
(Other definitions for elastic that I've seen before include "Pliable" , "'Flexible, springy (7)'" , "Like one across" , "Tape containing flexible rubber" , "Flexible, adaptable" .)