Mark —, 1984 and 1988 Olympic individual eventing gold medallist (4)
I believe the answer is:
todd
(Other definitions for todd that I've seen before include "Irish-born British actor and soldier, Richard, d. 2009" , "Sweeney, Fleet Street barber" , "Richard --, was Guy Gibson in The Dam Busters" , "Demon 12 of Fleet Street" , "19th-century demon barber of Fleet Street" .)