Evidence of murder shows solidity (4)
I believe the answer is:
body
'solidity' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for body that I've seen before include "(Physical part of) person (or persons)" , "Group of people" , "Corpus" , "Cadaver" , "Physique" .)