Wild stare by king and queen for naked intruder (8)
I believe the answer is:
streaker
'naked intruder' is the definition.
(eg a streaker on a football pitch)
'wild stare by king and queen' is the wordplay.
'wild' is an anagram indicator.
'by' is a charade indicator (letters next to each other).
'king and queen' becomes 'ker' (K for King and ER for Elizabeth Regina).
'stare' is an anagram of 'strea'.
'strea'+'ker'='STREAKER'
'for' acts as a link.
(Other definitions for streaker that I've seen before include "when not having a stitch" , "One running naked" , "Naked runner" , "Person who runs naked through a public place" , "A naughtily nude runner (8)." .)