Changed air date for broadcast (7)
I believe the answer is:
radiate
'broadcast' is the definition.
(I've seen this before)
'changed air date' is the wordplay.
'changed' indicates an anagram.
'air'+'date'='airdate'
'airdate' is an anagram of 'RADIATE'.
'for' acts as a link.
(Other definitions for radiate that I've seen before include "Shine" , "Emit light/heat" , "Emit (rays or waves)" , "Spoke out" , "Emit (light, heat, etc)" .)