No longer affected by tense public (5)

I believe the answer is:

overt

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'public' is the definition.
(both can mean well-known or unconcealed)

'no longer affected by tense' is the wordplay.
'no' becomes 'O' (resembles 0 - 'no' can mean 'zero').
'longer affected by tense' becomes 'vert' (I am not sure about this - if you are sure you should believe this answer much more).
'o'+'vert'='OVERT'

Can you help me to learn more?

(Other definitions for overt that I've seen before include "Conspicuous" , "Open and unconcealed" , "Open and observable" , "Plain to see - manifest" , "Not locked away" .)

I've seen this clue in The Independent.

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