Vigorous and enthusiastic enjoyment (5)
I believe the answer is:
gusto
'vigorous and enthusiastic enjoyment' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for gusto that I've seen before include "Hearty enjoyment" , "Spirit" , "Relish - zest" , "(Corporate) emblem" , "Zest, great enjoyment in doing" .)