Disgraceful event boy recalled, on examination (7)
I believe the answer is:
scandal
'disgraceful event' is the definition.
(I've seen this before)
'recalled on examination' is the wordplay.
'recalled' becomes 'dal' (I can't justify this - if you can you should believe this answer much more).
'on' means one lot of letters go next to another.
'examination' becomes 'scan' (scan is a kind of examination).
'dal' after 'scan' is 'SCANDAL'.
'boy' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for scandal that I've seen before include "Something shameful or disgraceful, often public" , "Cause of general outrage" , "something injurious to one's reputation" , "Malicious talk; outrage" , "Outraging event" .)