Crossword Genius

On radio not many would quarrel (4)

Ross

I believe the answer is:

feud

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

'quarrel' is the definition.
(I've seen this before)

'on radio not many would' is the wordplay.
I cannot quite understand how this works, but
'many' could be 'd' (Roman numeral for 500) and 'd' is present in the answer.
The remaining letters 'feu' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for feud that I've seen before include "Quarrel; spat" , "Persistent strife" , "Squabble" , "Bitter disagreement between families" , "State of prolonged mutual hostility" .)

I've seen this clue in The Times and 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.