Enthusiasm to go around United States intersection (5)
I believe the answer is:
gusto
'enthusiasm' is the definition.
(I know that gusto is a type of enthusiasm)
'go around united states intersection' is the wordplay.
'around' is an insertion indicator.
'united states' becomes 'US' (abbreviation for the United States).
'intersection' becomes 'T' (T junction).
'us'+'t'='ust'
'go' going around 'ust' is 'GUSTO'.
'to' acts as a link.
(Other definitions for gusto that I've seen before include "ardour" , "(Corporate) emblem" , "Relish - zest" , "Zest, pleasure in action" , "Hearty enjoyment" .)