Park employee called King Edward? (6)
I believe the answer is:
ranger
'park employee' is the definition.
(I've seen this before)
'called king edward?' is the wordplay.
'called' becomes 'rang' ('ring' can be a synonym of 'call').
'king edward?' becomes 'er' (abbreviation for Eduardus Rex).
'rang'+'er'='RANGER'
(Other definitions for ranger that I've seen before include "Rover" , "Keeper of national park or Texas policeman" , "Park warden" , "Top guide" , "Park employee" .)