Completed on time? That’s clear (5)
I believe the answer is:
overt
'clear' is the definition.
(both can mean apparent or obvious)
'completed on time?' is the wordplay.
'completed' becomes 'over' (synonyms).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'time?' becomes 't' (abbreviation).
'over'+'t'='OVERT'
'that's' is the link.
(Other definitions for overt that I've seen before include "This is not hard to see" , "Open to view" , "Open, not secret or hidden" , "Not locked away" , "Open and unconcealed" .)