What does the cryptic crossword clue "Note pop spilt in type of vehicle (4,3)" mean?

The definition is "vehicle". The wordplay uses an anagram. anagram of NOTE + POP = OPENTOP; definition: "vehicle" The answer is OPENTOP.

Note pop spilt in type of vehicle (4,3)

Daily Mail Cryptic #17075 | 10 Across | 2023-04-13 flower