Crossword Genius

Old transporter's role subtly changed (10)

Ross

I believe the answer is:

trolleybus

'old transporter's' is the definition.
(type of public transport)

'role subtly changed' is the wordplay.
'changed' indicates an anagram.
'role'+'subtly'='rolesubtly'
'rolesubtly' anagrammed gives 'TROLLEYBUS'.

(Another definition for trolleybus that I've seen is " Electrically driven public service vehicle".)

I've seen this clue in The Telegraph.
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