Run like heck (4)
I believe the answer is:
tear
'run like heck' 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 apart; drop" , "Rip or lacerate" , "Rate (anag.)" , "Lacerate - sign of sorrow" , "Rush - to pull apart" .)