The majority take a car test around the bus terminus (4)
I believe the answer is:
most
'the majority' is the definition.
(most of a group)
'a car test around the bus terminus' is the wordplay.
'a car test' becomes 'MOT'.
'around' indicates putting letters inside.
'the bus terminus' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'mot' going around 's' is 'MOST'.
'take' acts as a link.
Can you help me to learn more?
(Other definitions for most that I've seen before include "Kind of commercial pact where two countries agree to treat each other as well as any other" , "Greatest in amount or degree" , "Nearly all, majority" , "Extremely, very" , "In the highest degree" .)