Applaud a snare? Utter nonsense! (8)
I believe the answer is:
claptrap
'utter nonsense' is the definition.
'claptrap' can be an answer for 'nonsense' (informal term meaning nonsense or rubbish). I'm not certain of the 'utter' bit.
'applaud a snare?' is the wordplay.
'applaud' becomes 'clap' (synonyms).
'a snare?' becomes 'trap' (snare is a kind of trap).
'clap'+'trap'='CLAPTRAP'
Can you help me to learn more?
(Other definitions for claptrap that I've seen before include "Stuff and nonsense" , "Applaud snare? - that's pretentious nonsense" , "Meaningless nonsense" , "High-sounding nonsense" , "moonshine" .)