1964-66 Cheltenham Gold Cup winner ridden by Pat Taaffe (5)

I believe the answer is:

arkle

(Other definitions for arkle that I've seen before include "Classic racehorse" , "Famous steeplechaser" , "Famous racehorse" , "Irish winner of the Cheltenham Gold Cup in 1964, 1965 and 1966" .)

I've seen this clue in The Mirror.

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