Caught amidst increase in craving (9)
I believe the answer is:
'craving' is the definition.
(addiction is a kind of craving)
'caught amidst increase' is the wordplay.
I cannot quite understand how this works, but
'caught' could be 'ct' and 'ct' is found in the answer.
'increase' could be 'add' (I've seen this before) and 'add' is present in the answer.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for addiction that I've seen before include "hard to stop", "The origin of dependence", "Something to kick", "Compulsive habit", "I did act on (anag.)".)