Brace for party leader broadcast (4)
I believe the answer is:
pair
'brace' is the definition.
(a brace is a pair of something)
'party leader broadcast' is the wordplay.
'party leader' becomes 'p' (leader of the word 'party').
'broadcast' becomes 'air' (to air on TV).
'p'+'air'='PAIR'
'for' acts as a link.
(Other definitions for pair that I've seen before include "Two of a kind, as in cards" , "Two of a similar type" , "Duo" , "item" , "Brace, couple" .)