Apprehensive feeling (6)
'apprehensive feeling' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for angst that I've seen before include "uneasiness" , "Acute sense of remorse" , "(German) anxiety state" , "Oppressive feeling of worry, guilt" , "Anguish" .)
(Other definitions for unease that I've seen before include "Disquiet" , "Discomfort or apprehension" , "State of worry and lack of confidence" , "Anxiety, discontent" , "State of anxiety" .)