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