Air date revised for broadcast (7)
I believe the answer is:
radiate
'for broadcast' is the definition.
(I've seen this before)
'air date revised' is the wordplay.
'revised' indicates anagramming the letters.
'air'+'date'='airdate'
'airdate' anagrammed gives 'RADIATE'.
(Other definitions for radiate that I've seen before include "Emit light/heat" , "Shine" , "Spoke out" , "Give out (light, etc)" , "Disseminate" .)