Request harmony (5)
I believe the answer is:
order
I believe this clue is a double definition.
'request' is the first definition.
(an order is a request from someone in authority)
'harmony' is the second definition.
(order can mean harmony or neatness)
(Other definitions for order that I've seen before include "One may be tall if demanding" , "Regulation" , "Type of column" , "Enjoin in harmony" , "Edict, command" .)