Order to get rid of (7)
I believe the answer is:
Here is my best explanation:
This clue is a double definition.
'order' is the first definition.
'get rid of' is the second definition.
'to' is the link.
(Other definitions for dispose that I've seen before include "Get rid (of)", "make an arrangement", "Arrange - to get rid (of)", "Place in order (as God does)", "Arrange (in order)", "Spies do (anag) - get rid of", "Place in order; bestow" and "Incline".)