One way to apply a finish to education (5)

I believe the answer is:

expel

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I'm afraid I can't even guess how this answer relates to the clue.

(Other definitions for expel that I've seen before include "Deport" , "Drive away" , "Drive out - eject" , "Ban from school" , "Boot out" .)

I've seen this clue in The Telegraph and The Globe and Mail.

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