Impact of French book (4)
I believe the answer is:
dent
'impact' is the definition.
The definition and answer can be both related to natural events as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'of french book' is the wordplay.
'of french' becomes 'de' ('of' in French).
'book' becomes 'NT' (New Testament).
'de'+'nt'='DENT'
Can you help me to learn more?
(Other definitions for dent that I've seen before include "Slight hollow" , "tooth (13) [FRENCH]" , "Slight damage" , "'Dinge, depression (4)'" , "Surface hollow" .)