Crossword Genius

Guardiola's energy? (3)

Ross

I believe the answer is:

pep

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

I cannot understand how the rest of the clue works.

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(Other definitions for pep that I've seen before include "savings plan" , "Palindrome for vigour" , "Palindromic vim and vigour" , "Ginger; tax-free investment" , "Go" .)

I've seen this clue in The Sun.
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