Enjoyment of nothing after blast (5)
I believe the answer is:
gusto
'enjoyment' is the definition.
(I know that gusto is a type of enjoyment)
'nothing after blast' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'after' says to put letters next to each other.
'blast' becomes 'gust' (a blast of air).
'o' put after 'gust' is 'GUSTO'.
'of' is the link.
(Other definitions for gusto that I've seen before include "Relish - zest" , "Vigorous and enthusiastic enjoyment" , "Zest, exuberance" , "Great enthusiasm" , "ardour" .)