Golden couple's family helper? (2,4)
I believe the answer is:
au pair
'family helper?' is the definition.
(I've seen this before)
'golden couple's' is the wordplay.
'golden' becomes 'au'.
'couple' becomes 'pair' (synonyms).
'au'+'pair'='AU PAIR'
(Other definitions for au pair that I've seen before include "Live-in helper from overseas for board and lodging" , "Home help foreigner" , "Live-in young foreigner expected to do household chores" , "Young foreign student" , "Live-in home help" .)