Crossword Genius

B is for bonkers Brit abroad! (6)

Ross

I believe the answer is:

rosbif

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'bonkers brit abroad' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'b is for' is the wordplay.
'b is for' anagrams to 'ROSBIF'.
But, I am not clear how the anagram is indicated.

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I've seen this clue in The Times.
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