Crossword Genius

A relative at the BBC? (4)

Ross

I believe the answer is:

aunt

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'a relative' is the definition.
(aunt is a kind of relative)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for aunt that I've seen before include "Blood relative" , "Tuna (anag.)" , "Close relative" , "Parent's sister" , "Family relative" .)

I've seen this clue in the Evening Standard.
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