7 down
Shivering,
got
nearer
source
of
energy
(9)
Shivering, got nearer source of energy (9)
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The definition is at the end of the clue.
How the clue works
Look at source of energy — that's your definition, something that produces power. "Shivering" is your anagram indicator, and if you jumble up the letters of got nearer you get GENERATOR.