Cough syrup (7)
I believe the answer is:
linctus
'cough syrup' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for linctus that I've seen before include "Syrup that may see a cough off" , "Cough medicine" , "Special formulation" , "Thick cough mixture" , "Cough-medicine" .)