Acid? I don't suffer drug problem (9)
I believe the answer is:
addiction
'drug problem' is the definition.
The definition and answer can be both states of affairs as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'acid? i don't suffer' is the wordplay.
'suffer' indicates an anagram (I've seen 'suffers' mean this).
'acid'+'i'+'dont'='acididont'
'acididont' with letters rearranged gives 'ADDICTION'.
Can you help me to learn more?
(Other definitions for addiction that I've seen before include "Compulsive habit" , "The origin of dependence" , "I did act on (anag.)" , "Bug one's caught" , "Drug-habit" .)