Done time? That's clear (5)
I believe the answer is:
overt
'clear' is the definition.
(thesaurus)
'done time?' is the wordplay.
'done' becomes 'over' (I've seen this before).
'time?' becomes 't'.
'over'+'t'='OVERT'
'that's' acts as a link.
(Other definitions for overt that I've seen before include "Open and observable" , "Plainly apparent" , "____ is able to be seen" , "Done or shown openly" , "Open to view" .)