Lozenge target (5)
I believe the answer is:
cough
'lozenge target' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cough that I've seen before include "Confess to a crime" , "Respiratory infection" , "Bronchial infection" , "Abrupt exhalation" , "Hacking affliction" .)