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 am not sure about this - if you are sure you should give a lot more credence to this answer).
'during' means one lot of letters goes inside another.
'a car test' becomes 'MOT'.
's' inserted within 'mot' is 'MOST'.
'take' is the 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" .)