Ring in case there's something funny (7)

I believe the answer is:

cartoon

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

'ring in case' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for cartoon that I've seen before include "Witty drawing" , "Comic drawing" , "eg 'Tom & Jerry'" , "Comical drawing" , "Humorous drawing or film of a succession of them" .)

I've seen this clue in The Sun.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.