Bale's out injured for sure (8)
I believe the answer is:
absolute
'sure' is the definition.
(I've seen this before)
'bale's out injured' is the wordplay.
'injured' is an anagram indicator.
'bales'+'out'='balesout'
'balesout' with letters rearranged gives 'ABSOLUTE'.
'for' is the link.
(Other definitions for absolute that I've seen before include "Sheer - unqualified" , "Peremptory" , "Literary captain" , "Complete and unrestricted, say power" , "Not qualified or diminished in any way" .)