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 subsidiary indication.
'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' says the letters should be written backwards.
'semiger' back-to-front 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".)