He's transported by Dad's cooked greens (9)
I believe the answer is:
passenger
'he's transported' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'by dad's cooked greens' is the wordplay.
'by' says to put letters next to each other.
'dad's' becomes 'pa's' (pa can mean someone's father).
'cooked' indicates an anagram (letters cooked into a new form).
'greens' with letters rearranged gives 'senger'.
'pas' next to 'senger' is 'PASSENGER'.
Can you help me to learn more?
(Other definitions for passenger that I've seen before include "Traveller in a vehicle driven by someone else" , "burden to the team" , "Traveller not driving" , "One on a train perhaps" , "Useless member of team" .)