Crossword Genius

The nickname for Auntie! (4)

Ross

I believe the answer is:

beeb

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'auntie' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for beeb that I've seen before include "UK broadcaster (informal)" , "BBC (informally)" , "Old microcomputer" , "British Broadcasting Corporation (popularly)" , "BBC (colloq" .)

I've seen this clue in the Evening Standard.
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