Part of Mercedes, Cortina or another car (6)
I believe the answer is:
escort
'another car' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'part of mercedes cortina or' is the wordplay.
'part of' indicates a hidden word.
'ESCORT' can be found hidden inside 'mercedes cortina or'.
Can you help me to learn more?
(Other definitions for escort that I've seen before include "Ford car, first produced in 1968" , "Accompany, to protect perhaps" , "attendance" , "One who accompanies another" , "Companion (perhaps paid)" .)