Applaud role reversal? Such tosh! (8)
I believe the answer is:
claptrap
'tosh' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'applaud role reversal?' is the wordplay.
'applaud' becomes 'clap' (synonyms).
'role' becomes 'part' (eg a part or role in a film).
'reversal?' shows that the letters should be reversed in order (I've seen 'reversal' mean this).
'part' in reverse letter order is 'trap'.
'clap'+'trap'='CLAPTRAP'
'such' is the link.
Can you help me to learn more?
(Other definitions for claptrap that I've seen before include "Balderdash" , "Cobblers" , "Bull" , "Pretentious talk used to win applause" , "Foolish or pretentious talk" .)