Cuts short (6)
I believe the answer is:
aborts
'cuts short' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aborts that I've seen before include "Pulls the plug on" , "Brings to premature end" , "Terminates prematurely or miscarries" , "Ends prematurely" , "Brings to premature conclusion" .)