Soak takes crack (not Ecstasy), a sleep-inducing drug (9)
I believe the answer is:
soporific
'drug' is the definition.
(I know that soporific is a type of drug)
'soak takes crack not ecstasy a sleep-inducing' is the wordplay.
I cannot quite see how this works, but
'soak' could be 'sop' (dip food in liquid) and 'sop' is found in the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for soporific that I've seen before include "Causing sleepiness" , "Inducing mental lethargy" , "making one nod" , "Inducing drowsiness or sleep" , "Sedative" .)