Fellow accompanying queen, working for attendant (8)
I believe the answer is:
chaperon
'attendant' is the definition.
(thesaurus)
'fellow accompanying queen working' is the wordplay.
'fellow' becomes 'chap' ('chap' can be a synonym of 'fellow'**).
'accompanying' means one lot of letters go next to another.
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'working' becomes 'on'.
'chap'+'er'+'on'='CHAPERON'
'for' acts as a link.
(Other definitions for chaperon that I've seen before include "One who accompanies and supervises" , "One accompanies to supervise" , "One accompanies the vulnerable" , "Attendant" , "Car-phone (anag.)" .)