Escort man working to protect Queen (8)
I believe the answer is:
chaperon
'escort' is the definition.
(chaperoning is a kind of escorting)
'man working to protect queen' is the wordplay.
'man' becomes 'chap' (I've seen this in other clues**).
'working' becomes 'on'.
'to protect' is an insertion indicator.
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'chap'+'on'='chapon'
'chapon' going around 'er' is 'CHAPERON'.
(Other definitions for chaperon that I've seen before include "Car-phone (anag.)" , "Woman supervising girl" , "Escort" , "Person accompanying girl or younger group" , "One accompanies and looks after another person or group" .)