Crossword Genius

Bad baron, at it, one taking tourists for ride? (4-5)

Ross

I believe the answer is:

boat-train

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'one taking tourists for ride?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'bad baron at it' is the wordplay.
'bad' indicates an anagram.
'baron'+'at'+'it'='baronatit'
'baronatit' is an anagram of 'BOAT-TRAIN'.

Can you help me to learn more?

I've seen this clue in The Sun.
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