Crossword Genius

Swift horse (7)

Ross

I believe the answer is:

courser

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

This is all the clue.

(Other definitions for courser that I've seen before include "One hunting with dogs" , "Hunter of hares - speedy horse or bird" , "Swift horse" , "Runner" .)

I've seen this clue in The Wall Street Journal and The Times.
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