Crossword Genius

Whisper energy, energy (7)

Ross

I believe the answer is:

breathe

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'whisper' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for breathe that I've seen before include "Whisper" , "sigh" , "Express" , "Take into mouth" , "Inhale and exhale" .)

I've seen this clue in the Sydney Morning Herald.
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