Crossword Genius

Improving middle of song’s text with permission finally from director (2,3,4)

Ross

I believe the answer is:

on the mend

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'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" .)

I've seen this clue in The Hindu.
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