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