The normal thing in government (4)
I believe the answer is:
rule
This clue might be a double definition.
'the normal' is the first definition.
('rule' can be a synonym of 'normal')
'thing in government' is the second definition.
'rule' can be an answer for 'government' (rule can mean government or control). I am not certain of the 'thing in' bit.
Can you help me to learn more?
(Other definitions for rule that I've seen before include "Control; printed line" , "Control; thin line" , "Strip" , "Regulation, reign" , "Lure with regulation" .)