Hooked (8)
'hooked' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for addicted that I've seen before include "Dependent on drugs" , "Dependent on something habit-forming" , "Dependent, hooked" , "Seriously devoted (to a particular activity)" , "Hooked compulsively as by drugs" .)
(Other definitions for interested that I've seen before include "Showing curiosity" , "Not impartial" , "Fascinated" , "Concerned" , "Partisan" .)