Backing for each song that's made a comeback (7)
I believe the answer is:
replied
'made a comeback' is the definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Maybe they are linked in a way I don't understand?
'backing for each song' is the wordplay.
'backing for' shows that the letters should be reversed in order.
'each' becomes 'per'.
'song' becomes 'lied' (lied is a kind of song).
'per' back-to-front is 'rep'.
'rep'+'lied'='REPLIED'
'that's' is the link.
Can you help me to learn more?
(Other definitions for replied that I've seen before include "Gave answer" , "Made some response" , "Answered back" , "Responded" , "Wrote back" .)