King and queen to stop celebs revealing all (8)
I believe the answer is:
starkers
'revealing all' is the definition.
(informal term for naked)
'king and queen to stop celebs' is the wordplay.
'king and queen' becomes 'ker' (I've seen this in other clues).
'to stop' means one lot of letters goes inside another.
'celebs' becomes 'stars'.
'ker' put inside 'stars' is 'STARKERS'.
(Other definitions for starkers that I've seen before include "Not wearing a stitch" , "Like fairytale emperor" , "Completely naked" , "Quite naked (colloq.)" , "Slangily naked" .)