Emo emotion (5)
I believe the answer is:
angst
'emo emotion' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for angst that I've seen before include "Great anxiety" , "Acute sense of remorse" , "Oppressive feeling of worry, guilt" , "Acute anxiety about oneself" , "Nagging worry" .)