### Clue: Car model's right to incorporate a bit of plastic material (5)
### Answer: KAPOK 
 ### Explanation: Definition: material
 [ KA(a Ford car model) + OK(right!;good!) ] **containing**(to incorporate) **the 1st letter of**(a bit of) "plastic ".
Defn: Silky fibre from the seeds of the tropical silk cotton or kapok tree.