Stern parent (4)
I believe the answer is:
rear
This clue is a double definition.
'stern' is the first definition.
('rear' can be a synonym of 'stern')
'parent' is the second definition.
('rear' can be a synonym of 'parent')
(Other definitions for rear that I've seen before include "parent" , "what you may bring up" , "Raise - back" , "Rump" , "Rare at the back" .)