What's commercial TV read out? (6)
I believe the answer is:
'what's commercial' is the definition.
(I've seen this before)
'tv read out?' is the wordplay.
'out?' indicates an anagram (out can mean wrong or inaccurate).
'tvread' with letters rearranged gives 'ADVERT'.
(Other definitions for advert that I've seen before include "Publicity item", "Notice promoting goods", "Promotional notice", "Commercial (abbr)", "public announcement".)