Husband under-prepared; daughter and son get centuries (8)
I believe the answer is:
hundreds
'centuries' is the definition.
('hundred' can be a synonym of 'century')
'husband under-prepared daughter and son' is the wordplay.
'husband' becomes 'h'.
'prepared' is an anagram indicator.
'daughter' becomes 'd'.
'and' is a charade indicator (letters next to each other).
'son' becomes 's'.
'under' with letters rearranged gives 'undre'.
'h'+'undre'+'d'+'s'='HUNDREDS'
'get' acts as a link.
(Other definitions for hundreds that I've seen before include "Scores" , "See 7" , "See 10" , "old political divisions" , "Centuries" .)