A certain opinion on iconic TV broadcast (10)

I believe the answer is:

conviction

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'a certain opinion' is the definition.
'conviction' can be an answer for 'opinion' (thesaurus). I'm unsure of the 'a certain' bit.

'on iconic tv broadcast' is the wordplay.
'broadcast' indicates anagramming the letters (letters scattered or cast around).
'on'+'iconic'+'tv'='oniconictv'
'oniconictv' anagrammed gives 'CONVICTION'.

Can you help me to learn more?

(Other definitions for conviction that I've seen before include "Certainty" , "No doubt" , "it follows proof of guilt" , "in being found guilty" , "that may lead to imprisonment?" .)

I've seen this clue in The Guardian.

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