In television broadcast, one might air information of little importance (6)
I believe the answer is:
trivia
'information of little importance' is the definition.
'trivia' can be an answer for 'information' (I have seen 'Unimportant information ' mean 'trivia' so perhaps 'information' could also mean 'trivia'). I am not sure about the 'of little importance' bit.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for trivia that I've seen before include "petty considerations" , "minor points of interest?" , "Unimportant things, items of little value" , "Trifling things" , "Minutiae" .)