Breaks up soil, resulting in distress? (6)

I believe the answer is:

harrow

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'distress?' is the definition.
(something harrowing is distressing)

I can't explain the rest of the clue.

(Other definitions for harrow that I've seen before include "Till" , "Distress greatly - public school" , "English public school - farm implement" , "and another [SCHOO]" , "Plough, school" .)

I've seen this clue in The Irish Times.

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