What does the cryptic crossword clue "Broken cab that the PM and I want to get going (13)" mean?

The wordplay uses an anagram. anagram of CAB + THAT + THE + PM + I = CHAMPATTHEBIT The answer is CHAMPATTHEBIT.

Broken cab that the PM and I want to get going (13)

Independent Cryptic #1778 | 1 Across | 2024-03-24 flower