Caught wearing extra habit (9)
I believe the answer is:
addiction
'habit' is the definition.
(drug habit)
'caught wearing extra' is the wordplay.
I cannot quite understand how this works, but
'caught' could be 'ct' and 'ct' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for addiction that I've seen before include "Obsession" , "hard to stop" , "habit that's hard to break" , "Drug-habit" , "The origin of dependence" .)