Dan —, 1996 Olympic decathlon gold medallist (6)

I believe the answer is:

obrien

(Other definitions for obrien that I've seen before include "Kate . . . . . ., Flann . . . . . . (1'5)" , "Conor Cruise, Edna, Flann or Vincent" , "Irish writer" , "I be Ron, strangely, with this surname" , "Conor Cruise and Kate" .)

I've seen this clue in The Mirror.

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