Times shock broadcast (4)
I believe the answer is:
days
'times' is the definition.
(I know this)
'shock broadcast' is the wordplay.
'shock' becomes 'daze' (synonyms).
'broadcast' shows a homophone (sound like) (how the word might sound on the radio or TV).
'daze' sounds like 'DAYS'.
(Other definitions for days that I've seen before include "Periods (of week)" , "Twenty four-hour periods" , "Times" , "See 25" , "See 1 down" .)