Able to come back after a stretch (7)
I believe the answer is:
elastic
'stretch' is the definition.
(similar in meaning)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for elastic that I've seen before include "Flexible, adaptable" , "Like some bands" , "Fluid" , "Flexible (material)" , "Scale it (anag.)" .)