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A good thing for seedy teachers? (3)

Ross

I believe the answer is:

nut

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'teachers?' is the definition.
(National Union of Teachers)

I can't explain the rest of the clue.

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(Other definitions for nut that I've seen before include "Somebody obsessed" , "Large, hard-shelled seed" , "Hazel; beech" , "needing to get tight?" , "Head (sl.)" .)

I've seen this clue in the Evening Standard.
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