Half grand, Queen uplifted governments (7)
I believe the answer is:
Here is my best explanation:
'governments' is the definition.
('regime' can be a synonym of 'government')
'half grand queen uplifted' is the wordplay.
'half' becomes 'semi' (I've seen this before).
'grand' becomes 'g' ('G' can be a synonym of 'grand').
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'uplifted' is a reversal indicator.
'semiger' in reverse letter order is 'REGIMES'.
(Other definitions for regimes that I've seen before include "rules", "governments?", "Systems of government or courses of treatment" and "Governments in power".)