A loyal subject in Belgium (5)
I believe the answer is:
liege
This clue is a double definition.
'a loyal subject' is the first definition.
(I've seen this in another clue)
'in belgium' is the second definition.
(I know that Liege is part of Belgium)
(Other definitions for liege that I've seen before include "Belgian province" , "City in eastern Belgium" , "Loyal vassal" , "Large Belgian city" , "Belgian city on Meuse" .)