Crossword Genius

What cattle do is scratch (5)

Ross

I believe the answer is:

graze

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'is scratch' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for graze that I've seen before include "(Cow) feed; scrape" , "Tend at pasture" , "Eat grass; scrape skin" , "Feed in a pasture" , "Wound on skin" .)

I've seen this clue in The Irish Independent.
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