A breach of security (7)
I believe the answer is:
leakage
This clue could be a double definition.
'a breach' is the first definition.
The definition and answer can be both related to natural events as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'security' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for leakage that I've seen before include "Unwelcome flow" , "Evidence of loss" , "Escape of liquid or gas - or confidential information" , "Accidental escape (of a liquid or gas)" , "That which seeps out" .)