Unit is misplaced, as originally located (2,4)
I believe the answer is:
in situ
'as originally located' is the definition.
(I've seen this before)
'unit is misplaced' is the wordplay.
'misplaced' is an anagram indicator.
'unit'+'is'='unitis'
'unitis' with letters rearranged gives 'IN-SITU'.
(Other definitions for in situ that I've seen before include "American lift" , "Being in the original position, not having been moved" , "Appropriately positioned" , "In its original place, in Latin" , "Occupying the original or appropriate position" .)