Middle-distance runner, like Roger Bannister or Hicham El Guerrouj (5)

I believe the answer is:

miler

(Other definitions for miler that I've seen before include "Pre-metric middle-distance runner" , "horse" , "Athlete running 1,760 yards" , "Runner over a specific distance" , "one who competes in the long run" .)

I've seen this clue in The Guardian.

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