Desperate men head to addiction treatment (9)
I believe the answer is:
methadone
'addiction treatment' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'desperate men head to' is the wordplay.
'desperate' indicates an anagram (a desperate or pathetic spelling).
'men'+'head'+'to'='menheadto'
'menheadto' with letters rearranged gives 'METHADONE'.
Can you help me to learn more?
(Other definitions for methadone that I've seen before include "Synthetic analgesic" , "Synthetic drug taken to replace heroin" , "Drug used in treating heroin addiction" , "Narcotic analgesic drug" .)