Reaction to expulsion of boy playing around minor university (5,3)
I believe the answer is:
bless you
'reaction to expulsion' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'boy playing around minor university' is the wordplay.
'playing' is an anagram indicator.
'around' means one lot of letters goes inside another.
'minor' becomes 'less' (I've seen this before).
'university' becomes 'U' (abbreviation for university).
'boy' is an anagram of 'byo'.
'byo' enclosing 'less' is 'blessyo'.
'blessyo'+'u'='BLESS YOU'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for bless you that I've seen before include "Reaction to mild explosion" , "remark following ejection?" , "Gesundheit!" , "Thanks a lot!" , "Words said to a sneezer" .)