Crossword Genius

Right to stop plebs forming ruck (5)

Ross

I believe the answer is:

scrum

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

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

'right to stop plebs' is the wordplay.
I cannot quite understand how this works, but
'right' could be 'r' (common abbreviation) and 'r' is found in the answer.
The remaining letters 'scum' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'forming' acts as a link.

Can you help me to learn more?

(Other definitions for scrum that I've seen before include "riotous struggle" , "Disorderly mob" , "Rugby set-piece" , "Jostling crowd" , "Fracas" .)

I've seen this clue in The Sun.
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