Direst sort of pace (6)
I believe the answer is:
stride
'pace' is the definition.
(I know that pace can be written as stride)
'direst sort' is the wordplay.
'sort' indicates an anagram.
'direst' with letters rearranged gives 'STRIDE'.
'of' acts as a link.
(Other definitions for stride that I've seen before include "Walk with long steps" , "Long pace" , "march" , "Take long steps" , "use your legs!" .)