Rectifying concerning bandage (10)

I believe the answer is:

redressing

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'rectifying' is the definition.
Although both the answer and definition are present participle verbs, I cannot understand how one could define the other.

'concerning bandage' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'bandage' becomes 'dressing' (I've seen this before).
're'+'dressing'='REDRESSING'

Can you help me to learn more?

(Other definitions for redressing that I've seen before include "getting back into gear" , "adjusting" , "Correcting" , "Making corrections" .)

I've seen this clue in The Daily Express.

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