Improving middle of song’s text with permission finally from director (2,3,4)
I believe the answer is:
on the mend
'improving' is the definition.
(on the mend means improving after an illness)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for on the mend that I've seen before include "Becoming better in health" , "Making recovery" , "Regaining health" , "Recovering from an injury or illness" , "Improving in health" .)