Make a rule against new bread (5)

I believe the answer is:

debar

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

'make a rule against' is the definition.
I can't judge whether this definition defines the answer.

'new bread' is the wordplay.
'new' is an anagram indicator.
'bread' with letters rearranged gives 'DEBAR'.

Can you help me to learn more?

(Other definitions for debar that I've seen before include "Exclude (from right)" , "Exclude from a place" , "Blackball" , "Prevent from doing something" , "Rule out" .)

I've seen this clue in the Evening Standard.

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