Again makes concessions, as does a backer? (7)
I believe the answer is:
recedes
'does a backer?' is the definition.
I can't judge whether this defines the answer.
'again makes concessions' is the wordplay.
'again' becomes 're'.
'makes concessions' becomes 'cedes' (I can't explain this - if you can you should give a lot more credence to this answer).
're'+'cedes'='RECEDES'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for recedes that I've seen before include "Withdraws" , "Subsides" .)