From what we hear, certain horses eat in the field (5)

I believe the answer is:

graze

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'eat in the field' is the definition.
(eg animals graze in a field)

I can't explain the remainder of the clue.

(Other definitions for graze that I've seen before include "Abrasion" , "Eat grass in a field" , "Wound on skin" , "To eat constantly" , "Eat grass, or snack" .)

I've seen this clue in The Telegraph.

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