Gesture from gals in broadcast (6)
I believe the answer is:
signal
'gesture' is the definition.
(I've seen this in another clue)
'gals in broadcast' is the wordplay.
'broadcast' indicates an anagram (letters scattered or cast around).
'gals'+'in'='galsin'
'galsin' is an anagram of 'SIGNAL'.
'from' acts as a link.
(Other definitions for signal that I've seen before include "Noteworthy" , "Gesture, light or sound which sends a message" , "Communication by sign" , "Gesticulate" , "important to train drivers > striking" .)