Evident through time (5)
I believe the answer is:
overt
'evident' is the definition.
(thesaurus)
'through time' is the wordplay.
'through' becomes 'over' (I've seen this in other clues**).
'time' becomes 't'.
'over'+'t'='OVERT'
(Other definitions for overt that I've seen before include "Open and observable" , "Plain to see - manifest" , "Open,up front" , "Done in an obvious way" , "Done or shown openly" .)