What does the cryptic crossword clue "After a shift, we scrub workers' vehicle (4,3)" mean?

The wordplay uses an anagram. anagram of WE + SCRUB = CREWBUS The answer is CREWBUS.

After a shift, we scrub workers' vehicle (4,3)

Daily Mail Cryptic #17210 | 25 Across | 2023-10-19 flower