Couple performing loudly upset hosts (3)
I believe the answer is:
duo
'couple' is the definition.
(synonyms)
'performing loudly upset hosts' is the wordplay.
'hosts' indicates a hidden word.
'upset' says the letters should be written backwards.
'oud' can be found hidden inside 'performing loudly'.
'oud' reversed gives 'DUO'.
(Other definitions for duo that I've seen before include "Double act" , "Pair of people/things" , "Two-person act" , "Pair of musicians" , "Performing couple" .)