A type of puzzle (6)
I believe the answer is:
jigsaw
'a type of puzzle' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for jigsaw that I've seen before include "Sharp tool (for cutting puzzle into pieces?)" , "Puzzle - powered cutter" , "Puzzle fittingly completed" , "Problem with fitting in" , "Woodcutter" .)