Crossword Genius

Important teacher picked up dismissing component of education (4)

Ross

I believe the answer is:

head

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'important' is the definition.
(similar in meaning)

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

Can you help me to learn more?

(Other definitions for head that I've seen before include "Skull" , "Leader; stream source" , "bean" , "Beer foam; front" , "Chief; bonce" .)

I've seen this clue in The Independent.
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