Dubbed King Edward about the end of the day (8)
I believe the answer is:
knighted
'dubbed' is the definition.
('knight' can be a synonym of 'dub')
'king edward about the end of the day' is the wordplay.
'king' becomes 'k'.
'edward' becomes 'ed'.
'about' means one lot of letters go next to another.
'the end of the day' becomes 'night' (I've seen this before).
'ed' after 'night' is 'nighted'.
'k'+'nighted'='KNIGHTED'
(Other definitions for knighted that I've seen before include "Made a Sir" , "Dubbed 'Sir'" , "Given an honour" , "Given a title" .)