Ten years with books makes you dissolute (8)
I believe the answer is:
decadent
'dissolute' is the definition.
(thesaurus)
'ten years with books' is the wordplay.
'ten years' becomes 'decade' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'books' becomes 'nt' (New Testament).
'decade'+'nt'='DECADENT'
'makes you' acts as a link.
(Other definitions for decadent that I've seen before include "Fin-de-sicle" , "abandoned" , "Abandoning principles" , "Reprobate" , "Debauched" .)