Hump: cop off in the arms of Morpheus? (8,9)
I believe the answer is:
sleeping policeman
'arms of morpheus?' is the definition.
The definition suggests a singular noun which matches the answer.
'hump cop off in' is the wordplay.
I cannot really understand how this works, but
'cop' could be 'policeman' (I've seen this in another clue) and 'policeman' is found within the answer.
'in' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'the' acts as a link.
Can you help me to learn more?
(Other definitions for sleeping policeman that I've seen before include "Speed control device" , "slowing you down - with 12a" , "The Force Awakens? Except for him" .)