Addicted (6)
I believe the answer is:
hooked
'addicted' is the definition.
('hook' can be a synonym of 'addict')
This is all the clue.
(Other definitions for hooked that I've seen before include "Enthralled" , "Addicted or curved down" , "Curved down, like an eagle's beak" , "Unable to come off drugs" , "Addicted; (fish) caught" .)