That suitable for “show” trial? (8)
I believe the answer is:
Here is my best explanation:
'show trial?' is the definition.
'evidence' can be an answer for 'show' (evidencing is a kind of showing). I am not sure about the 'trial?' bit.
I don't understand how the rest of the clue works.
(Other definitions for evidence that I've seen before include "Facts on which to establish verdict", "It's given in court", "Facts and figures relevant to a case", "Information in a law case", "Indication", "grounds", "Matters of fact put to a court", "Signs, indications", "Facts given in court" and "Information to help form a conclusion".)