Don't allow bread to crumble (5)

I believe the answer is:

debar

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'don't allow' is the definition.
I can't judge whether this defines the answer.

'bread to crumble' is the wordplay.
'to crumble' indicates an anagram.
'bread' with letters rearranged gives 'DEBAR'.

Can you help me to learn more?

(Other definitions for debar that I've seen before include "Prohibit (from doing something)" , "Exclude (from doing something)" , "Prevent from doing something" , "Formally prevent" , "Exclude - bread (anag)" .)

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