Saline drip (4)
I believe the answer is:
tear
'saline drip' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tear that I've seen before include "Rip - drop from eye" , "Lacerate - sign of sorrow" , "Lachrymal fluid" , "Rip, sever roughly" , "Droplet; rip" .)