Rum's not drunk as a remedy (7)
I believe the answer is:
nostrum
'a remedy' is the definition.
(I know that nostrum is a type of remedy)
'rum's not drunk' is the wordplay.
'drunk' indicates anagramming the letters.
'rums'+'not'='rumsnot'
'rumsnot' with letters rearranged gives 'NOSTRUM'.
'as' acts as a link.
(Other definitions for nostrum that I've seen before include "Panacea or cure-all" , "Phoney panacea" , "Tonic" , "Quack medicine - run most (anag)" , "Hypothetical remedy for all ills" .)