Kind of puzzle (6)
I believe the answer is:
jigsaw
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">kind of puzzle</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for jigsaw that I've seen before include "As pastime" , "Puzzle in which pieces must be reassembled" , "Puzzle fittingly completed" , "Sharp tool (for cutting puzzle into pieces?)" , "Kind of puzzle" .)