Mark wastes comeback (4)

I believe the answer is:

spot

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

This might be a double definition.

'mark' is the first definition.
(I know that spot is a type of mark)

'wastes comeback' is the second definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?

Can you help me to learn more?

(Other definitions for spot that I've seen before include "See 5" , "Pickle" , "Notice; mark" , "See 12" , "clock" .)

I've seen this clue in The Guardian.

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.