Crossword Genius

Excess publicity about show? Definitely (12)

Ross

I believe the answer is:

overexposure

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'excess' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'publicity about show? definitely' is the wordplay.
'publicity' becomes 'exposure' (I've seen this before).
'about' means one lot of letters go next to another.
'show? definitely' becomes 'over' (I can't explain this - if you can you should believe this answer much more).
'exposure' after 'over' is 'OVEREXPOSURE'.

Can you help me to learn more?

(Other definitions for overexposure that I've seen before include "extra time in good light" , "Too much visibility" , "Photo given too much light" .)

I've seen this clue in The Telegraph.
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