Next dead king (5)
I believe the answer is:
later
'next' is the definition.
(I've seen this in other clues)
'dead king' is the wordplay.
'dead' becomes 'late' (similar in meaning).
'king' becomes 'R' (abbreviation for rex, king in Latin).
'late'+'r'='LATER'
(Other definitions for later that I've seen before include "More recent" , "Not just yet" , "Eventually" , "after the rest?" , "at a future date" .)