Short-lived rant about current broadcast outside (9)
I believe the answer is:
transient
'short-lived' is the definition.
(synonyms)
'rant about current broadcast outside' is the wordplay.
'about' is an anagram indicator.
'current' becomes 'I' (symbol for electric current).
'broadcast' becomes 'sent' (I've seen this in other clues).
'outside' indicates putting letters inside.
'i' placed inside 'sent' is 'sient'.
'rant' is an anagram of 'tran'.
'tran'+'sient'='TRANSIENT'
(Other definitions for transient that I've seen before include "Fleeting" , "Here today, gone tomorrow" , "Passing, short-lived" , "fugitive" , "Lasting little time" .)