Enthusiasm got us confused (5)
I believe the answer is:
gusto
'enthusiasm' is the definition.
(I know that gusto is a type of enthusiasm)
'got us confused' is the wordplay.
'confused' is an anagram indicator.
'got'+'us'='gotus'
'gotus' is an anagram of 'GUSTO'.
(Other definitions for gusto that I've seen before include "Vigorous and enthusiastic enjoyment" , "Zest and enjoyment in doing something" , "Zest, great enjoyment in doing" , "Spirit" , "Great enjoyment, vigour" .)