Rock group got older and medically treated (8)
I believe the answer is:
bandaged
'medically treated' is the definition.
'bandaged' can be an answer for 'treated' (similar in meaning). I'm not sure about the 'medically' bit.
'rock group got older' is the wordplay.
'rock group' becomes 'band' (I've seen this in another clue).
'got older' becomes 'aged' ('age' can be a synonym of 'get older').
'band'+'aged'='BANDAGED'
'and' is the link.
Can you help me to learn more?
(Other definitions for bandaged that I've seen before include "patched up?" , "Dressed" , "strapped up" .)