Court official, that woman below us (5)
I believe the answer is:
usher
'court official' is the definition.
(official in a law court)
'woman below us' is the wordplay.
'woman' becomes 'her' (her refers to a woman).
'below' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'her' after 'us' is 'USHER'.
'that' is the link.
(Other definitions for usher that I've seen before include "Person who shows one to a seat" , "One conducts people to seats" , "Show in - escort" , "Doorkeeper; shower to seat" , "Person showing one to a seat" .)