What does the cryptic crossword clue "Boatman's last to provide a new start to illuminate the dark (5)" mean?

The definition is "dark". The wordplay uses acrostic. N (deletion) + IGHT (deletion) = NIGHT; definition: "the dark" The answer is NIGHT.

Boatman's last to provide a new start to illuminate the dark (5)

Guardian Cryptic #29011 | 24 Across | 2023-03-07 flower