Lightweight hat (6)
I believe the answer is:
panama
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lightweight hat</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 "Man's hat" , "Style of hat" , "Canal state; hat" , "city" , "Great canal in middle America" .)