Question about king supporting eastern attendant (7)
I believe the answer is:
equerry
'attendant' is the definition.
(equerry is a kind of attendant)
'question about king supporting eastern' is the wordplay.
'question' becomes 'query' ('query' can be a synonym of 'question'**).
'about' is an insertion indicator.
'king' becomes 'r' (r is abbreviation for rex).
'supporting' says to put letters next to each other (in a down clue, some letters go below others).
'eastern' becomes 'e'.
'query' going around 'r' is 'querry'.
'querry' after 'e' is 'EQUERRY'.
(Other definitions for equerry that I've seen before include "Attendant in royal household" , "Royal family official" , "Officer attending a royal family member" , "Officer attendant upon British sovereign" , "Officer of the British royal household" .)