Make evident (5,2,5)
There are a few possibilities for this:
bring to light
'make evident' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for attest that I've seen before include "Give sworn evidence" , "Give testimony in a court of law" , "say, in court" , "Bear formal witness to, give evidence" , "University town" .)
'make evident' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for evince that I've seen before include "Give expression to" , "Venice (anag.)" , "Express,show" , "Show or reveal, say interest" , "Indicate, show clearly" .)
(Other definitions for bring to light that I've seen before include "Expose" , "what one might do with spill" , "Unearth" , "Reveal" .)