Broadcast has Meg upset, a bit (7)
I believe the answer is:
segment
'a bit' is the definition.
(thesaurus)
'broadcast has meg upset' is the wordplay.
'broadcast' becomes 'sent' (I've seen this in other clues).
'has' means one lot of letters goes inside another.
'upset' indicates anagramming the letters.
'meg' anagrammed gives 'gme'.
'sent' enclosing 'gme' is 'SEGMENT'.
(Other definitions for segment that I've seen before include "Section of a circle" , "Part of a circle cut off by a chord" , "One part of a whole" , "Piece of an orange" , "Separate" .)