Vehicle taking us on a secondary road (3)
I believe the answer is:
bus
'vehicle' is the definition.
(public transport vehicle)
'us on a secondary road' is the wordplay.
'on' is a charade indicator (letters next to each other).
'a secondary road' becomes 'b' (I can't justify this - if you can you should give a lot more credence to this answer).
'us' put after 'b' is 'BUS'.
'taking' acts as a link.
Can you help me to learn more?
(Other definitions for bus that I've seen before include "Large passenger vehicle - small business!" , "Of projectiles; (go) mad (slang)" , "Charabanc" , "Use transport" , "Road vehicle able to carry many passengers" .)