Royal house for all to see in beginning (6)
I believe the answer is:
stuart
'royal house' is the definition.
(royal house of Scotland and England)
'for all to see in beginning' is the wordplay.
'for all to see' becomes 'u' (short for Universal film certificate).
'in' indicates putting letters inside.
'beginning' becomes 'start' (start is a kind of beginning).
'u' placed inside 'start' is 'STUART'.
(Other definitions for stuart that I've seen before include "House that used to lead" , "Name of royal family" , "9 [HOUSE]" , "Royal house of Scotland and Britain" , "C17 royal house" .)