Injuring ox, speed that's revealed (7)
I believe the answer is:
exposed
'revealed' is the definition.
(exposing is a kind of revealing)
'injuring ox speed' is the wordplay.
'injuring' is an anagram indicator (I've seen 'injured' mean this).
'ox'+'speed'='oxspeed'
'oxspeed' with letters rearranged gives 'EXPOSED'.
'that's' acts as a link.
(Other definitions for exposed that I've seen before include "Showed up" , "Laid bare" , "Not hidden" , "at mercy of weather" , "Without protection" .)