Immediately in charge of electricity (6)
I believe the answer is:
static
'electricity' is the definition.
(static electricity is a kind of electricity)
'immediately in charge' is the wordplay.
'immediately' becomes 'stat' (stat can informally mean at once).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'stat'+'ic'='STATIC'
'of' is the link.
(Other definitions for static that I've seen before include "Lacking change" , "showing no signs of going anywhere" , "it can shock and > ruin the reception" , "That's shocking!" , "TV or radio interference" .)