Crossword Genius

Energy saving scheme (3)

Ross

I believe the answer is:

pep

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This could be a double definition.

'energy' is the first definition.
(personal energy, vim)

'saving scheme' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

Can you help me to learn more?

(Other definitions for pep that I've seen before include "Vim and vitality" , "Palindrome for vitality or energy" , "Energy or enthusiasm" , "Ginger; tax-free investment" , "Get-up-and-go" .)

I've seen this clue in The Mirror.
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