Air date changed and spread out (7)
I believe the answer is:
radiate
'spread out' is the definition.
(radiate can mean to spread or scatter)
'air date changed' is the wordplay.
'changed' indicates anagramming the letters.
'air'+'date'='airdate'
'airdate' is an anagram of 'RADIATE'.
'and' is the link.
(Other definitions for radiate that I've seen before include "broadcast" , "Emit rays; diverge" , "Give out (light, etc)" , "Spoke out" , "A tirade (anag)" .)