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