Court officials chaired on high (7)
I believe the answer is:
umpires
'court officials' is the definition.
'umpires' can be an answer for 'officials' (umpire is a kind of official). I'm not sure about the 'court' bit.
'chaired on high' is the wordplay.
I cannot quite understand how this works, but
'on' could be 're' ('on' can be mean 'with reference to') and 're' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for umpires that I've seen before include "Referees for cricket marches" , "they want fair play" , "Officials at cricket matches" , "Sports adjudicators" , "Officials at cricket match" .)