Shake up trash can (6)
I believe the answer is:
dismay
'shake up' is the definition.
(I know that dismay is a kind of affright)
'trash can' is the wordplay.
'trash' becomes 'dis' (I've seen this in another clue).
'can' becomes 'may' (synonyms).
'dis'+'may'='DISMAY'
(Other definitions for dismay that I've seen before include "Feeling of surprise and discouragement" , "Alarm, distress" , "Feeling of despair in the face of obstacles" , "Fill with consternation" , "Disappointment" .)