What does the cryptic crossword clue "On public transport, I’m not sure one goes on foot (7)" mean?

The definition is "foot". The wordplay uses a charade (building blocks). TRAIN (synonym=""public transport"") + ER (synonym=""I'm not sure"") = TRAINER The answer is TRAINER.

On public transport, I’m not sure one goes on foot (7)

Guardian Cryptic #29545 | 22 Across | 2024-11-20 flower

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