What does the cryptic crossword clue "Opening letter, I nail it up the wall (7)" mean?

The definition is "Opening letter". The wordplay uses an anagram. anagram of I + NAIL + IT = INITIAL; definition: "Opening letter," The answer is INITIAL.

Opening letter, I nail it up the wall (7)

Guardian Cryptic #29040 | 7 Across | 2023-04-10 flower

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