Crossword Genius

What cattle feed on in Switzerland (7)

Ross

I believe the answer is:

lucerne

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

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

Can you help me to learn more?

(Other definitions for lucerne that I've seen before include "Fodder plant, alfalfa" , "Clover-like plant used for fodder" , "clover?" , "Alfalfa - Swiss lake and resort" , "ake" .)

I've seen this clue in The Irish Independent.
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