Sort out instruction to waiter (5)
I believe the answer is:
order
'sort out' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for order that I've seen before include "Rank" , "plan to reorganise Europe with 1a [NEW]" , "System" , "Fettle - kilter" , "Tidy state - that's a command" .)