Regulations covering a German analgesic (7)
I believe the answer is:
codeine
'analgesic' is the definition.
(codeine is a kind of analgesic)
'regulations covering a german' is the wordplay.
'regulations' becomes 'code' (I've seen this before).
'covering' is an insertion indicator.
'a german' becomes 'ein' ('a' in German).
'code' going around 'ein' is 'CODEINE'.
(Other definitions for codeine that I've seen before include "Niece, do take this drug" , "Analgesic drug" , "Morphine-derived analgesic; die once (anag.)" , "Mild narcotic used as a pain-killer" , "An anodyne" .)