Horror of nudist as teacher (8)
I believe the answer is:
distaste
'horror' is the definition.
(I have seen 'Mild horror' mean 'distaste' so perhaps 'horror' could also mean 'distaste')
'of nudist as teacher' is the wordplay.
'of' says the answer is hidden in the clue.
'DISTASTE' is hidden in the letters of 'nudist as teacher'.
(Other definitions for distaste that I've seen before include "Loathing" , "Abhorrence" , "mild revulsion" , "Dislike of something unsavoury" , "Is stated (anag.)" .)