A sick benefit prescription? (6)
I believe the answer is:
emetic
'a sick benefit prescription?' 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?
This is all the clue.
Can you help me to learn more?
(Other definitions for emetic that I've seen before include "Sickening" , "A medicine to induce nausea" , "making you throw up" , "Something that causes vomiting" , "Medicine designed to make one vomit" .)