Will exonerate: that's evident (5)
I believe the answer is:
clear
'evident' is the definition.
(synonyms)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for clear that I've seen before include "Bright" , "Acquit" , "Open; not cloudy" , "Disengaged" , "Unobstructed" .)