Mitchell & ___ (sports apparel company) (4)

I believe the answer is:

ness

(Other definitions for ness that I've seen before include "Famous loch" , "Where you're reputed to see monster" , "Scottish Loch famed for monster" , "Scottish lake with traditional monster" , "Eliot -, led effort against Al Capone; Scots loch" .)

I've seen this clue in The New York Times.

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