What does the cryptic crossword clue "In habitual procedure sent a letter to be read aloud (4)" mean?

The wordplay uses a homophone (sounds like). Sounds like (to be read aloud) of ‘wrote’ (sent a letter) The answer is ROTE.

In habitual procedure sent a letter to be read aloud (4)

Guardian Cryptic #29483 | 7 Down | 2024-09-09 flower