What does the cryptic crossword clue "The box containing novelties I repacked (10)" mean?

The definition is "The box". The wordplay uses an anagram. anagram of NOVELTIES + I = TELEVISION; definition: "The box" The answer is TELEVISION.

The box containing novelties I repacked (10)

Guardian Cryptic #29041 | 18 Across | 2023-04-11 flower