Backed down about advanced edition (8)
I believe the answer is:
relented
'backed down' is the definition.
(I've seen this in another clue)
'about advanced edition' is the wordplay.
'about' becomes 're' (regarding).
'advanced' becomes 'lent' (advance can mean to lend).
'edition' becomes 'ed'.
're'+'lent'+'ed'='RELENTED'
(Other definitions for relented that I've seen before include "Gave in and became less severe" , "Give in (to pleas?)" , "Grew less severe" , "Became less intense" , "Gave in (to pleas?)" .)