Dances about with tool (6)
I believe the answer is:
jigsaw
'tool' is the definition.
(I've seen this before)
'dances about with' is the wordplay.
'dances' becomes 'jigs' (jig is a kind of dance).
'about with' becomes 'aw' (this might be a standard abbreviation I've not previously seen).
'jigs'+'aw'='JIGSAW'
(Other definitions for jigsaw that I've seen before include "Woodcutter" , "Puzzle-maker" , "As pastime" , "Problem with fitting in" , "Picture in pieces" .)