What does the cryptic crossword clue "One who belittles journalist reversing vehicle (9)" mean?

The definition is "One". The wordplay uses a reversal. DE (synonym="DE") + TRACTOR (synonym="‘vehicle’") = DETRACTOR The answer is DETRACTOR.

One who belittles journalist reversing vehicle (9)

Guardian Cryptic #29603 | 23 Across | 2025-01-28 flower