Type of puzzle (6)
'type of puzzle' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for jigsaw that I've seen before include "Puzzle fittingly completed" , "Puzzle in which pieces must be reassembled" , "Puzzle-maker" , "Puzzle - powered cutter" , "As pastime" .)
(Other definitions for acrostic that I've seen before include "code?" , "Type of word puzzle" , "Verse where eg the first letters in each line form a word or message" , "Poem where first letters of lines spell a word" , "Initial letter puzzle" .)
(Other definitions for word square that I've seen before include "puzzle that might be to your taste" , "Puzzle with solutions reading the same down as across" , "Puzzle where the same letters read across as read down" .)