Crossword Genius

Transport for vagrant mostly (4)

Ross

I believe the answer is:

tram

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'transport' is the definition.
(tram is a kind of transport)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for tram that I've seen before include "Bus on rails" , "An early form of Luas in Dublin transport" , "Vehicle running on rails in road" , "Car on rails" , "Electrically driven transport" .)

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