Ruling on misuse of medical apparatus (4,4)
I believe the answer is:
iron lung
'medical apparatus' 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?
'ruling on misuse' is the wordplay.
'misuse' indicates an anagram.
'ruling'+'on'='rulingon'
'rulingon' anagrammed gives 'IRON LUNG'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for iron lung that I've seen before include "Artificial respiration chamber" , "Cylinder used in treating polio" , "Rigid case fitting over body for artificial respiration" , "breather" , "'Type of metal respirator (4,4)'" .)