Be exclusive in bread production (5)

I believe the answer is:

debar

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'be exclusive' is the definition.
The answer and definition are not the same part of speech.

'bread production' is the wordplay.
'production' indicates anagramming the letters.
'bread' anagrammed gives 'DEBAR'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for debar that I've seen before include "Block" , "Exclude, prohibit" , "Blackball" , "Formally prevent" , "Stop" .)

I've seen this clue in the Evening Standard.

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