Higher than everyone in the exam? (7)
I believe the answer is:
tallest
'higher than' is the definition.
I can't tell whether this definition defines the answer.
'everyone in the exam?' is the wordplay.
'everyone' becomes 'all' (all people).
'in the' is an insertion indicator.
'exam?' becomes 'test' (synonyms).
'all' put inside 'test' is 'TALLEST'.
Can you help me to learn more?
(Other definitions for tallest that I've seen before include "Most high" , "Of greatest height" , "most unlikely" , "Of extreme height" , "Most incredible" .)