What King Edward did -- or Jack, Diana and Catherine (8)
I believe the answer is:
abdicate
'what king edward did' is the definition.
I can't tell whether this defines the answer.
'jack diana and catherine' is the wordplay.
'jack' becomes 'ab' (both can mean a sailor).
'diana' becomes 'di' (Di is short for Diana).
'and' says to put letters next to each other.
'catherine' becomes 'cate' (I've seen this in other clues).
'ab'+'di'+'cate'='ABDICATE'
'or' acts as a link.
Can you help me to learn more?
(Other definitions for abdicate that I've seen before include "quit" , "Resign from monarchy" , "Leave throne" , "Resign from or renounce the throne" , "Vacate the throne voluntarily" .)