Get back – and get better (7)
I believe the answer is:
recover
This clue is a triple definition!
'get back' is the first definition.
(I've seen this before)
'and' acts as a link.
'get' is the second definition.
(recovering is a kind of getting)
'better' is the third definition.
(recovering is a kind of bettering)
(Other definitions for recover that I've seen before include "get fit again" , "comeback" , "Regain" , "Find" , "Recuperate" .)