What does the cryptic crossword clue "Back turn worked when manoeuvring towing vehicle (9,5)" mean?

The wordplay uses an anagram. anagram of BACK + TURN + WORKED = BREAKDOWNTRUCK The answer is BREAKDOWNTRUCK.

Back turn worked when manoeuvring towing vehicle (9,5)

Daily Mail Cryptic #17028 | 6 Across | 2023-02-07 flower