Country once British Honduras (6)
I believe the answer is:
belize
This clue is a double definition.
'country' is the first definition.
(Belize is an example)
'once british honduras' is the second definition.
(I've seen this before)
(Other definitions for belize that I've seen before include "Central American state" , "Central American republic" , "Central American country, formerly British Honduras" , "Caribbean country" , "Commonwealth state" .)