Tear, split (3)
I believe the answer is:
rip
I believe this clue is a double definition.
'tear' is the first definition.
(I know that tear can be written as rip)
'split' is the second definition.
(I know that split can be written as rip)
(Other definitions for rip that I've seen before include "Letters often seen on gravestone" , "Tear, rend" , "Letters often carved on gravestones" , "Letters appended to writing on gravestone" , "death wish" .)