Perhaps Belgian name given to everyone in court (7)
I believe the answer is:
walloon
'perhaps belgian' is the definition.
(Walloons are an ethnic group of Belgium)
'name given to everyone in court' is the wordplay.
'name' becomes 'n' (common abbreviation e.g. on forms).
'given to' says to put letters next to each other.
'everyone' becomes 'all' (all people).
'in' means one lot of letters goes inside another.
'court' becomes 'woo' (both can mean to romance someone).
'all' put within 'woo' is 'walloo'.
'n' after 'walloo' is 'WALLOON'.
(Other definitions for walloon that I've seen before include "Francophone" , "European" , "Southern Belgian" , "Belgian dialect" , "French-speaking Belgian" .)