Boy attendant (4)
I believe the answer is:
page
'boy attendant' is the definition.
(page can mean a boy servant)
This is the entire clue.
(Other definitions for page that I've seen before include "Kind of leaf, or boy in old court" , "Gentleman dwelling at Windsor" , "Attendant - sheet" , "Youth acting as a knight's attendant" , "Young hotel employee" .)