Request sequence (5)
I believe the answer is:
order
I believe this is a double definition.
'request' is the first definition.
(an order is a request from someone in authority)
'sequence' is the second definition.
(I know that sequence is a more specific form of the action order)
(Other definitions for order that I've seen before include "Reserved goods" , "pattern" , "Directive for harmony" , "demanding firm discipline" , "Command or written direction" .)