Sailor briefly in middle of spacious Corsican location (7)
I believe the answer is:
ajaccio
'corsican location' is the definition.
(capital of Corsica)
I don't understand the remainder of the clue.
(Other definitions for ajaccio that I've seen before include "Corsican town, Napoleon's birthplace" , "Corsica seaport and capital city" , "Corsican city" , "Corsican capital" , "island capital" .)