Crossword Genius

What might be soap box? (2,3)

Ross

I believe the answer is:

tv set

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'soap box?' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for tv set that I've seen before include "Goggle-box" , "'Goggle box (2,3)'" .)

I've seen this clue in The Sun.
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