Crossword Genius

Farming school? (6)

Ross

I believe the answer is:

harrow

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This could be a double definition.

'farming' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

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

Can you help me to learn more?

(Other definitions for harrow that I've seen before include "worry" , "Break new ground" , "Agricultural frame for breaking up soil" , "Torment (at public school?)" , "Break up (ground) - distress (feelings)" .)

I've seen this clue in the Evening Standard.
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