Traditional supporter of the board of education (5)

I believe the answer is:

easel

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'traditional supporter' is the definition.
'easel' can be an answer for 'supporter'. I am not certain of the 'traditional' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for easel that I've seen before include "Artist's prop" , "Picture stand" , "Tripod for an artist" , "Artist's tripod" , "Support in the studio" .)

I've seen this clue in the Evening Standard.

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