You and I will get healthy (4)
I believe the answer is:
well
I believe this clue is a double definition.
'you and i will' is the first definition.
(we will)
'healthy' is the second definition.
(associated in meaning)
'get' acts as a link.
(Other definitions for well that I've seen before include "Bore; extremely" , "satisfactory manner?" , "Competently" , "Sunken shaft; very much" , "Abundant source" .)