A stroke of the cat may produce it (4)
I believe the answer is:
purr
This clue could be a double definition.
'a stroke' is the first definition.
The answer and definition can be both related to natural events as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'cat may produce it' is the second definition.
I know that 'cat' relates to this answer.
'of the' is the link.
Can you help me to learn more?
(Other definitions for purr that I've seen before include "Express contentment" , "Happy feline sound" , "Cat noise" , "Sound of contentment" , "Cat's contented sound" .)