Reject proposals concerning government (8)
I believe the answer is:
overrule
'reject proposals' is the definition.
'overrule' can be an answer for 'reject' (I've seen this before). I am unsure of the 'proposals' bit.
'concerning government' is the wordplay.
'concerning' becomes 'over' (both can mean relating to).
'government' becomes 'rule' (rule can mean government or control).
'over'+'rule'='OVERRULE'
Can you help me to learn more?
(Other definitions for overrule that I've seen before include "Impose a decision on" , "Disallow from a superior position" , "This is not OK" , "Don't allow" , "Countermand" .)