Some of the teachers suffer discomfort (4)
I believe the answer is:
ache
'discomfort' is the definition.
(I've seen this in another clue)
'some of the teachers suffer' is the wordplay.
'some of' indicates the answer is hidden within the clue.
'ACHE' is hidden in the letters of 'teachers suffer'.
(Other definitions for ache that I've seen before include "Dull throbbing pain" , "A dull lingering pain" , "anguish" , "painful" , "Long ? pain" .)