Crossword Genius

Knight supplies said tour (7)

Ross

I believe the answer is:

circuit

'tour' is the definition.
(I know that tour can be written as circuit)

I can't explain the rest of the clue.

(Other definitions for circuit that I've seen before include "Motor racing track" , "Lap; judge's journey" , "Device for forming electronic connections" , "Once around the track" , "Race track" .)

I've seen this clue in The Times.
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