TV Jack may be in (3,3)

I believe the answer is:

the box

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand how the remainder of the clue works.

(Another definition for the box that I've seen is " TV (sl.)".)

I've seen this clue in the Evening Standard.

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