I believe the answer is:
'sorrowful drop' 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 "Move quickly; pull apart" , "It's secreted by the lachrymal gland" , "A globule of eye moisture" , "Lachrymal fluid" , "Small flaw, as in glass" .)