Look tired in class again (3)

I believe the answer is:

sag

'look tired' is the definition.

'in class again' is the wordplay.
'in' says the answer is hidden in the clue.
'SAG' is hidden within 'class again'.

(Other definitions for sag that I've seen before include "Subsidence" , "Slump" , "Drop" , "Sinking" , "Sink, hang down" .)

I've seen this clue in the Evening Standard.

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