Question put by examiners? Fancy that! (4,2,3,4)
I believe the answer is:
what do you know
'examiners? fancy that' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'question put by' is the wordplay.
I cannot quite understand how this works, but
'by' could be 'at' and 'at' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for what do you know that I've seen before include "Expression of incredulity" , "I'm surprised!" , "How good was your education" , "Well I never!" .)