One sees no upset ladies next to king and queen (8)
I believe the answer is:
onlooker
'one sees' is the definition.
'no upset ladies next to king and queen' is the wordplay.
'upset' says the letters should be written in reverse.
'ladies' becomes 'loo' ('the ladies' is a type of loo or toilet).
'next to' says to put letters next to each other.
'king and queen' becomes 'ker' (I've seen this in other clues).
'no' reversed gives 'on'.
'on'+'loo'+'ker'='ONLOOKER'
(Other definitions for onlooker that I've seen before include "Witness" , "Spectator" , "He's not involved - just observing" , "Person watching" , "One observes" .)