Fast runner no sporting type we're told (7)
I believe the answer is:
cheetah
'fast runner' is the definition.
(I've seen this before)
'no sporting type we're told' is the wordplay.
'no sporting type' becomes 'cheater'.
'we're told' shows a homophone (sound like).
'cheater' is a homophone of 'CHEETAH'.
(Other definitions for cheetah that I've seen before include "Fast-running creature" , "Fast-running cat" , "Fast-moving creature" , "Fast predator" , "Large spotted wild cat, very fast" .)