It's wrong when you take an exam (3)
I believe the answer is:
sit
'you take an exam' is the definition.
I can't tell whether this defines the answer.
'it's wrong' is the wordplay.
'wrong' indicates an anagram.
'its' with letters rearranged gives 'SIT'.
'when' is the link.
Can you help me to learn more?
(Other definitions for sit that I've seen before include "To take the test" , "(Of bird) stay on nest" , "Model" , "Take weight off feet" , "Take (an examination)" .)