Crossword Genius

Half of them show too little appreciation perhaps for major report (11)

Ross

I believe the answer is:

thunderclap

I'm a little stuck... Click here to teach me more about this clue!

'major report' is the definition.
The definition and answer can be both related to natural events as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'half of them show too little appreciation perhaps' is the wordplay.
I cannot really understand how this works, but
'show' could be 'er' (US medical drama) and 'er' is located in the answer.
'little' could be 'l' (abbreviation) and 'l' is present in the answer.
This explanation may well be incorrect...

'for' acts as a link.

Can you help me to learn more?

(Other definitions for thunderclap that I've seen before include "Noise from the sky" , "Report of electrical power strike" , "lot of unexpected noise" , "Sudden loud noise (in a storm)" , "Boom" .)

I've seen this clue in The Times.
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