Crossword Genius

Thunder a bit upsetting? Nonsense! (8)

Ross

I believe the answer is:

claptrap

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'nonsense' is the definition.
(informal term meaning nonsense or rubbish)

'thunder a bit upsetting?' is the wordplay.
'thunder' becomes 'clap' (I am not sure about this - if you are sure you should believe this answer much more).
'a bit' becomes 'part' (both can mean a piece of something).
'upsetting?' is a reversal indicator (I've seen 'upsetting' mean this).
'part' back-to-front is 'trap'.
'clap'+'trap'='CLAPTRAP'

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(Other definitions for claptrap that I've seen before include "Pretentious talk used to win applause" , "Bull" , "poppycock" , "Cobblers" , "Applaud snare? - that's pretentious nonsense" .)

I've seen this clue in the Evening Standard.
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