On time for public viewing (5)

I believe the answer is:

overt

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'for public viewing' is the definition.
I can't tell whether this defines the answer.

'on time' is the wordplay.
'on' becomes 'over' (I've seen this in other clues).
'time' becomes 't' (abbreviation).
'over'+'t'='OVERT'

Can you help me to learn more?

(Other definitions for overt that I've seen before include "Explicit" , "Open to view" , "Done or shown openly" , "Open and observable" , "Open and candid" .)

I've seen this clue in The Telegraph.

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