Crossword Genius

Go up a second time (3)

Ross

I believe the answer is:

pep

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'go' is the definition.
(both can mean energy or vitality)

I don't understand how the rest of the clue works.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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