What the passenger did, mentioning the road (4)
I believe the answer is:
rode
'what the passenger did' is the definition.
I can't tell whether this defines the answer.
'mentioning the road' is the wordplay.
'mentioning' shows a homophone (sound like).
'road' is a homophone of 'RODE'.
Can you help me to learn more?
(Other definitions for rode that I've seen before include "Went on horeseback" , "Travelled on horse" , "Went mounted" , "did some travelling" , "Travelled on the back of an animal" .)