Brown's legislation upset teachers as a body (6)
I believe the answer is:
walnut
'brown's' is the definition.
(thesaurus)
'legislation upset teachers as a body' is the wordplay.
I cannot really understand how this works, but
'teachers' could be 'nut' (National Union of Teachers) and 'nut' is located in the answer.
'a' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for walnut that I've seen before include "Large, wrinkled edible seed" , "Tree providing decorative wood" , "Wrinkled tree-fruit with a hard shell" , "Hard seed with furrowed shell" , "likely to get cracked at Christmas" .)