Crossword Genius

Mad teachers get extremely testy (5)

Ross

I believe the answer is:

nutty

'mad' is the definition.
(thesaurus)

'teachers get extremely testy' is the wordplay.
'teachers' becomes 'nut' (National Union of Teachers).
'get' is a charade indicator (letters next to each other).
'extremely' means to remove the middle letters.
'testy' with its centre taken out is 'ty'.
'nut'+'ty'='NUTTY'

(Other definitions for nutty that I've seen before include "Like brazils, say" , "Like, eg, brazils" , "Eccentric - like nougat?" , "Crackers" , "Insane" .)

I've seen this clue in The Independent.
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