Drug reduced dreaming (7)
I believe the answer is:
aspirin
This clue could be a double definition.
'drug' is the first definition.
(aspirin is a kind of drug)
'reduced dreaming' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
Can you help me to learn more?
(Other definitions for aspirin that I've seen before include "Anti-inflammatory drug" , "Mild pain-killing drug" , "answer to pain?" , "Headache killer?" , "Anti-inflammatory analgesic" .)