Excluded from class, son gets in a temper (3,2,5)
I believe the answer is:
out of sorts
'in a temper' is the definition.
I know nothing about this answer so I can't judge whether this works.
'excluded from class son' is the wordplay.
'excluded from' becomes 'out of' (I've seen this before).
'class' becomes 'sort' (synonyms).
'son' becomes 's' (genealogical abbreviation for son).
'outof'+'sort'+'s'='OUT OF SORTS'
'gets' is the link.
Can you help me to learn more?
(Other definitions for out of sorts that I've seen before include "Not feeling quite right" , "Not feeling good" , "Slightly unhappy" , "Slightly unwell" , "Irritable" .)