A broadcast outside more costly: help from abroad found? (2,4)
I believe the answer is:
au pair
'help from abroad found?' is the definition.
(au pair can mean a foreign childcare helper)
'a broadcast outside more costly' is the wordplay.
'broadcast' becomes 'air' (to air on TV).
'outside' is an insertion indicator.
'more costly' becomes 'up' (as in prices that have gone up).
'a'+'air'='aair'
'aair' enclosing 'up' is 'AU PAIR'.
(Other definitions for au pair that I've seen before include "Home help from abroad?" , "Foreign lodger doing housework" , "does she work for board?" , "Young foreigner doing light domestic duties in return for keep" , "Young foreign person offering domestic help in exchange for lodgings" .)