More senseless to earn in broadcasting (6)
I believe the answer is:
inaner
'more senseless' is the definition.
(I've seen this in another clue)
'earn in broadcasting' is the wordplay.
'broadcasting' indicates an anagram.
'earn'+'in'='earnin'
'earnin' is an anagram of 'INANER'.
'to' is the link.
(Other definitions for inaner that I've seen before include "What's relatively lemon-like" , "Rather silly" , "More empty" , "More stupid" , "More vacuous" .)