Locate it in the southeast (4)
I believe the answer is:
site
'locate' is the definition.
(I know that locate can be written as site)
'it in the southeast' is the wordplay.
'in the' is an insertion indicator.
'southeast' becomes 'SE' (synonyms).
'it' going inside 'se' is 'SITE'.
(Other definitions for site that I've seen before include "internet location" , "Situation (of a building)" , "Whereabouts" , "station" , "Locale" .)