Dramatic ending (11)
I believe the answer is:
cliffhanger
'dramatic ending' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for cliffhanger that I've seen before include "tense ending to episode" , "Dramatic ending" , "Contest with the outcome in doubt right to the end" , "it keeps everyone in suspense" , "Tense, suspenseful situation" .)