Firm turning off current to make wiring safe for government office (9)
I believe the answer is:
consulate
'government office' is the definition.
'firm turning off current to make wiring safe' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'turning off' suggests deleting specific letters (some letters are turned away or turned off).
'current' becomes 'I' (symbol for electric current).
'to make wiring safe' becomes 'insulate' (insulating electrical wires).
'insulate' with 'i' taken out is 'nsulate'.
'co'+'nsulate'='CONSULATE'
'for' is the link.
(Other definitions for consulate that I've seen before include "Diplomatic residence" , "Diplomatic mission" , "embassy" , "office" , "Government official in a foreign country" .)