Feeling unwell, having no more classes (3,2,5)

I believe the answer is:

out of sorts

'feeling unwell' is the definition.

'having no more classes' is the wordplay.
'having no more' becomes 'outof'.
'classes' becomes 'sorts' ('sort' can be a synonym of 'class').
'outof'+'sorts'='OUT OF SORTS'

(Other definitions for out of sorts that I've seen before include "under the weather" , "Slightly unwell" , "Not well" , "Not feeling good" , "Not feeling quite right" .)

I've seen this clue in The Guardian.

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