Spooner's to check appointment's in order (7)
I believe the answer is:
dictate
'order' is the definition.
('dictate' can be a synonym of 'order')
I cannot understand how the remainder of the clue works.
(Other definitions for dictate that I've seen before include "Order; determine" , "Issue commands" , "say" , "Give orders like Stalin" , "speak slowly" .)