Crossword Genius

Granite taken from gas turbine by commercial transport (3)

Ross

I believe the answer is:

bus

I'm a little stuck... Click here to teach me more about this clue!

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for bus that I've seen before include "Public transport vehicle" , "Use transport" , "Large passenger vehicle - small business!" , "Road vehicle able to carry many passengers" , "Charabanc" .)

I've seen this clue in the Irish Times.
Want a hint initially instead of a full solution? Install my app