Sport in old part of Yorkshire (6)
I believe the answer is:
riding
This clue is a double definition.
'sport' is the first definition.
(I know that riding is a type of sport)
'old part of yorkshire' is the second definition.
(historical term for a region of Yorkshire)
'in' acts as a link.
(Other definitions for riding that I've seen before include "Horsemanship - once a third part of Yorkshire" , "On top" , "Division of Yorkshire" , "County division for a sporting activity" , "Sitting on and controlling the movements of a horse" .)