Examination that some take for a laugh? (4)
I believe the answer is:
oral
'examination' is the definition.
(oral is a kind of examination)
'some take for a laugh?' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ORAL' can be found hidden inside 'take for a laugh'.
'that' is the link.
(Other definitions for oral that I've seen before include "Kind of examination" , "Ant; tourist (dial.)" , "language exam" , "Mouth-related" , "Relating to the mouth - exam" .)