Diplomatic mission (7)
'diplomatic mission' is the definition.
(legation is a kind of diplomatic mission)
This is all the clue.
(Other definitions for legation that I've seen before include "Embassy" , "Official residence of diplomat and staff" , "Diplomatic minister and staff, and their residence" , "A long tie (anag.)" , "Diplomatic group or mission" .)
'diplomatic mission' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for embassy that I've seen before include "Headquarters of diplomatic staff abroad" , "Ambassador's residence" , "diplomatic venue" , "Diplomatic outpost" , "Overseas mission" .)