Publication featuring King Edward's face and Mrs Simpson (5)
I believe the answer is:
marge
'mrs simpson' is the definition.
(I've seen this in other clues)
'publication featuring king edward's face' is the wordplay.
'publication' becomes 'mag' (abbreviation for magazine).
'featuring' means one lot of letters goes inside another.
'king' becomes 'R' (abbreviation of Latin rex).
'face' suggests taking the first letters.
The first letter of 'edwards' is 'e'.
'mag' enclosing 'r' is 'marg'.
'marg'+'e'='MARGE'
'and' acts as a link.
(Other definitions for marge that I've seen before include "limit" , "Butter substitute (abbr)" , "edge, poetically" , "Fat" , "Homer's wife" .)