Go for the return (3)

I believe the answer is:

pep

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

I cannot understand how the remainder of the clue works.

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

I've seen this clue in the Evening Standard.

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