Become aware of outspoken broadcast (5)
I believe the answer is:
scent
'become aware of' is the definition.
(I've seen this in another clue)
'outspoken broadcast' is the wordplay.
'outspoken' indicates a 'sounds like' (homophone) clue.
'broadcast' becomes 'sent' (I've seen this in other clues).
'sent' sounds like 'SCENT'.
(Other definitions for scent that I've seen before include "Distinctive smell" , "Get wind of" , "Track; aroma" , "Distinctive aroma" , "Number of clues" .)