Electrician put on board (6)
I believe the answer is:
sparks
'electrician' is the definition.
(I've seen this before)
'put on board' is the wordplay.
'put' becomes 'park' (parking is a kind of putting**).
'on' is an insertion indicator.
'board' becomes 'ss' (I've seen this in other clues).
'park' put within 'ss' is 'SPARKS'.
(Other definitions for sparks that I've seen before include "Radio officer" , "Glowing particles for a colloquial radio operator" , "Fiery particles for informal electrician" , "Electrical discharges" , "Bright discharges" .)