Both sides in final broadcast show panache (5)
I believe the answer is:
flair
'panache' is the definition.
(I know that panache can be written as flair)
'both sides in final broadcast' is the wordplay.
'both sides in' means to remove the middle letters (only the side letters remain).
'broadcast' becomes 'air' (to air on TV).
'final' with its centre removed is 'fl'.
'fl'+'air'='FLAIR'
'show' acts as a link.
(Other definitions for flair that I've seen before include "Style, panache" , "Natural talent or panache" , "Faculty" , "Bent" , "Creative brilliance" .)