What does the cryptic crossword clue "Part of course: all of it except the start (4)" mean?

The definition is "Part of course". The wordplay uses acrostic. HOLE (deletion) = HOLE; definition: "Part of course:" The answer is HOLE.

Part of course: all of it except the start (4)

Guardian Cryptic #29229 | 26 Across | 2023-11-16 flower