Piano (broadcast item) (4)
I believe the answer is:
pair
'item' is the definition.
(both can mean a romantic couple)
'piano broadcast' is the wordplay.
'piano' becomes 'p' (musical abbreviation).
'broadcast' becomes 'air' (synonyms).
'p'+'air'='PAIR'
(Other definitions for pair that I've seen before include "Two of a similar type" , "Put together - two of a kind" , "Agreement to avoid division" , "Cereal used as food" , "Twosome" .)