Quack remedy (7)
I believe the answer is:
nostrum
'quack remedy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nostrum that I've seen before include "our Latin" , "Favourite remedy or scheme" , "Phoney panacea" , "Must Ron take a quack remedy?" , "Quack remedy or pet scheme" .)