Group of seven bright stars in the constellation Ursa Major (6)

I believe the answer is:

plough

(Other definitions for plough that I've seen before include "O'Casey play 'The . . . . . . and the Stars'" , "break new ground, perhaps" , "Furrower of soil" , "Farm tool and group of stars" , "Furrow cutter" .)

I've seen this clue in The Guardian.

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