Frightened on a Wednesday (4)
I believe the answer is:
awed
'frightened' is the definition.
(awing is a kind of frightening)
'on a wednesday' is the wordplay.
'on' is a charade indicator (letters next to each other).
'wednesday' becomes 'wed' (short for Wednesday).
'a'+'wed' is 'AWED'.
(Other definitions for awed that I've seen before include "Struck with fear/wonder" , "mouth open?" , "in wonderment" , "was dazzling" , "Overcome with reverence or wonder" .)