Heart-wrenching (6)
I believe the answer is:
tragic
'heart-wrenching' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tragic that I've seen before include "heartbreaking" , "Causing extreme distress or sorrow" , "Extremely sad; Mahler's 6th nickname" , "like King Lear" , "Calamitous, very sad" .)