Neighbor of Costa Rica (6)
I believe the answer is:
panama
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">neighbor of costa rica</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)