School that comes down heavily on clods? (6)

I believe the answer is:

harrow

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'school' is the definition.
(famous UK public school)

I don't understand the rest of the clue.

(Other definitions for harrow that I've seen before include "Farm implement with spikes" , "Cultivator that pulverizes or smooths soil" , "Clod breaker" , "A school; agricultural implement" , "Till" .)

I've seen this clue in the Evening Standard.

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