Pay Swede to design a racetrack (8)
I believe the answer is:
speedway
'a racetrack' is the definition.
(speedway is a kind of racetrack)
'pay swede to design' is the wordplay.
'to design' indicates anagramming the letters.
'pay'+'swede'='payswede'
'payswede' is an anagram of 'SPEEDWAY'.
(Other definitions for speedway that I've seen before include "SPORT/GAME" , "used for cycle racing" , "Race-track" , "fast-track competition" , "Form of motorcycle racing" .)