Crossword Genius

Spooner makes bovine buzz. Why? (3,4)

Ross

I believe the answer is:

how come

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'why?' is the definition.
('how come' can be a synonym of 'why')

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for how come that I've seen before include "Explain why" , "What's the reason" .)

I've seen this clue in the Sydney Morning Herald.
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