Dresden novel about love signed on the back (8)
I believe the answer is:
endorsed
'signed on the back' is the definition.
(I've seen this before)
'dresden novel about love' is the wordplay.
'novel' indicates an anagram.
'about' is an insertion indicator.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'dresden' with letters rearranged gives 'endrsed'.
'endrsed' placed around 'o' is 'ENDORSED'.
(Other definitions for endorsed that I've seen before include "Gave the go-ahead" , "Certified or supported" , "Given public approval" , "Formally backed" , "Seconded" .)