Something productive in retirement? (9)
I believe the answer is:
soporific
'retirement?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for soporific that I've seen before include "Sedative" , "making one nod" , "Causing sleepiness" , "Inducing mental lethargy" , "Inducing drowsiness or sleep" .)