Help with introductions to an unusual party broadcast (2,4)
I believe the answer is:
au pair
'help' is the definition.
(type of home help)
'introductions to an unusual party broadcast' is the wordplay.
'introductions to' says to take the initial letters.
'broadcast' becomes 'air' (synonyms).
The initial letters of 'an unusual party' is 'aup'.
'aup'+'air'='AU PAIR'
'with' acts as a link.
(Other definitions for au pair that I've seen before include "Foreign lodger doing housework" , "Family assistant" , "Foreign girl who helps domestically for board and lodging" , "Foreign girl who helps in the home for her keep" , "Home help foreigner" .)