TV set remained off during this!? (13)

I believe the answer is:

I'm a little stuck... Click here to teach me more about this clue!

'during this?' is the definition.
The definition suggests a singular noun which matches the answer.

'tv set remained off' is the wordplay.
'off' indicates an anagram.
'tv'+'set'+'remained'='tvsetremained'
'tvsetremained' anagrammed gives 'ADVERTISEMENT'.

Can you help me to learn more?

(Other definitions for advertisement that I've seen before include "Public promotion" , "Publicity announcement" , "trailer" , "Notice - commercial" , "Commercial promotion" .)

I've seen this clue in the Sydney Morning Herald.

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