Completely out of order (4)
I believe the answer is:
dead
This could be a double definition.
'completely' is the first definition.
(synonyms)
'out of order' is the second definition.
'dead' can be an answer for 'out' (thesaurus). I'm not certain of the 'of order' bit.
Can you help me to learn more?
(Other definitions for dead that I've seen before include "As was Monty Python's parrot" , "Absolutely" , "directly" , "Late; exact" , "no longer with us" .)