Well-organised (9)
I believe the answer is:
efficient
'well-organised' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for efficient that I've seen before include "Functioning effectively" , "working economically at speed" , "Working in a well-organised and competent way" , "Producing results with little waste of effort" , "Performing with little wastage" .)