Jigsaw element (5)
I believe the answer is:
piece
'jigsaw element' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for piece that I've seen before include "Component; portion" , "that may follow show after work party?" , "King, perhaps" , "one of eight once ready for the Spanish?" , "king or queen?" .)