Neighbor of Costa Rica (6)
I believe the answer is:
panama
'neighbor of costa rica' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for panama that I've seen before include "Country - hat - canal - cigar" , "Great canal connecting Atlantic and Pacific" , "Man's hat" , "Great canal in middle America" , "isthmus" .)