Wager Mark will find something fast to drive? (6,3)
I believe the answer is:
sports car
'something fast to drive?' is the definition.
(fast car)
'wager mark' is the wordplay.
'wager' becomes 'sport' (sport can mean wager).
'mark' becomes 'scar' (mark left by an injury).
'sport'+'scar'='SPORTS-CAR'
'will find' acts as a link.
(Other definitions for sports car that I've seen before include "Soft-top, say" , "Low-slung two-seater" , "One often with hood down" , "Lotus perhaps" , "fast vehicle" .)