Classic horse race at Doncaster; final leg of the English Triple Crown (2,5)

I believe the answer is:

st leger

(Other definitions for st leger that I've seen before include "Annual Doncaster race" , "fixture for the flat" , "Annual horse-race for 3-yearolds at Doncaster" , "Flat race" , "Classic Doncaster horse race" .)

I've seen this clue in The Mirror.

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