Extra time open to view (5)
I believe the answer is:
overt
'open to view' is the definition.
(I've seen this in another clue)
'extra time' is the wordplay.
'extra' becomes 'over' (both can mean left over).
'time' becomes 't' (abbreviation).
'over'+'t'='OVERT'
(Other definitions for overt that I've seen before include "Open, not 1 across" , "totally visible" , "____ is able to be seen" , "Open and undisguised" , "Open and candid" .)