A party having trouble (3)
I believe the answer is:
ado
'trouble' is the definition.
(thesaurus)
'a party' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'a'+'do'='ADO'
'having' is the link.
(Other definitions for ado that I've seen before include "Fuss, difficulty" , "agitation" , "stir" , "Rapid bustling commotion" , "excitement" .)