Withdrew southeast and surrendered (7)
I believe the answer is:
seceded
'withdrew' is the definition.
(I've seen this before)
'southeast and surrendered' is the wordplay.
'southeast' becomes 'SE' (synonyms).
'and' is a charade indicator (letters next to each other).
'surrendered' becomes 'ceded' ('cede' can be a synonym of 'surrender').
'se'+'ceded'='SECEDED'
(Other definitions for seceded that I've seen before include "Withdrew from an organization" , "Broke away" .)