Crossword Genius

Classes very restless, teacher stressed at first (5)

Ross

I believe the answer is:

sorts

'classes' is the definition.
('sort' can be a synonym of 'class')

'very restless teacher stressed at first' is the wordplay.
'very' becomes 'so' (I've seen this in other clues**).
'at first' indicates taking the first letters.
The initial letters of 'restless teacher stressed' is 'rts'.
'so'+'rts'='SORTS'

(Other definitions for sorts that I've seen before include "Varieties" , "Arranges in correct or desired sequence" , "Kinds" , "Segregates items into groups" , "Arranges in different groups" .)

I've seen this clue in The Times.
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