New form of power then made widely available (5,4)
I believe the answer is:
threw open
'made widely available' is the definition.
'new form of power then' is the wordplay.
'new form of' indicates an anagram.
'power'+'then'='powerthen'
'powerthen' is an anagram of 'THREW OPEN'.
I've seen this clue in The Times.
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