Applaud catch that's rubbish? (8)
I believe the answer is:
claptrap
'rubbish?' is the definition.
(thesaurus)
'applaud catch' is the wordplay.
'applaud' becomes 'clap' ('clap' can be a synonym of 'applaud').
'catch' becomes 'trap' (trapping is a kind of catching).
'clap'+'trap'='CLAPTRAP'
'that's' is the link.
(Other definitions for claptrap that I've seen before include "Tripe" , "Stuff and nonsense" , "Balderdash" , "Bunk" , "Utter rubbish" .)