Energy, vitality (3)
I believe the answer is:
pep
I believe this is a double definition.
'energy' is the first definition.
(personal energy, vim)
'vitality' is the second definition.
(I've seen this in another clue)
(Other definitions for pep that I've seen before include "Palindromic vim and vigour" , "Energy, liveliness" , "savings plan" , "Palindrome for vitality or energy" , "Ginger; tax-free investment" .)