Huge great king around house being old man? (10)
I believe the answer is:
fatherhood
'being old man?' is the definition.
(being a father - your old man is your father)
'huge great king around house' is the wordplay.
'huge' becomes 'fat' (both can mean large).
'great king' becomes 'Herod' (Biblical king).
'around' is an insertion indicator.
'house' becomes 'ho' (abbreviation for house).
'herod' placed around 'ho' is 'herhood'.
'fat'+'herhood'='FATHERHOOD'
(Other definitions for fatherhood that I've seen before include "old man" , "responsibility over issue" , "Paternity" .)