Crossword Genius

Heard of mark on potato publication (9)

Ross

I believe the answer is:

spectator

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

'publication' is the definition.
(the Spectator is a magazine)

'heard of mark on potato' is the wordplay.
I cannot quite understand how this works, but
'heard' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
'of' could be 'o' and 'o' is found within the answer.
'on' could be 'at' (I've seen this in other clues) and 'at' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for spectator that I've seen before include "Person watching" , "Onlooker at game" , "Onlooker; magazine" , "Part of gate" , "I attend sporting event" .)

I've seen this clue in The Times.
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.