Something to goggle at (3,3)

I believe the answer is:
the box
'at' is the definition.
The answer and definition can be both quantities as well as being singular nouns.
Perhaps there's an association between them I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Another definition for the box that I've seen is " TV (sl.)".)
Want a hint initially instead of a full solution?
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