What may symbolise one rule man breaks (7)

I believe the answer is:

numeral

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'what may symbolise one' is the definition.
I can't judge whether this defines the answer.

'rule man breaks' is the wordplay.
'breaks' indicates an anagram.
'rule'+'man'='ruleman'
'ruleman' with letters rearranged gives 'NUMERAL'.

Can you help me to learn more?

(Other definitions for numeral that I've seen before include "Such as 5, 9, iii, etc" , "Eg, two or seven" , "Eg, 5, nine or 6301" , "1, 2, 3, say" , "Symbol for number" .)

I've seen this clue in The Times.

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