Bit left over is not even intended for broadcast (7)
I believe the answer is:
oddment
'bit left over' is the definition.
'not even intended for broadcast' is the wordplay.
'not even' becomes 'odd' ('odd' is the opposite to 'even').
'intended' becomes 'meant' (meaning is a kind of intending).
'for broadcast' shows a homophone (sound like).
'meant' is a homophone of 'ment'.
'odd'+'ment'='ODDMENT'
'is' acts as a link.
(Other definitions for oddment that I've seen before include "Left over item" , "Leftover item" , "Curiosity, peculiarity" , "Just a bit left" , "Piece left over, no match" .)