Crossword Genius

Grass protecting ring broke with established customs (8)

Ross

I believe the answer is:

rebelled

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

'broke with established customs' is the definition.
The answer and definition can be both to do with social activities as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?

'grass protecting ring' is the wordplay.
I cannot really see how this works, but
'ring' could be 'bell' (I've seen this before) and 'bell' is present in the answer.
'grass' could be 'reed' (I've seen this before) and 'reed' is found in the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for rebelled that I've seen before include "Fought against authority" , "was revolting" , "Revolted" , "Rose in opposition" , "Red belle (anag.)" .)

I've seen this clue in The Telegraph.
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