Royal home, nominally (6)
I believe the answer is:
ernest
'royal home nominally' is the definition.
I can't judge whether this defines the answer.
'royal home' is the wordplay.
'royal' becomes 'er' (abbreviation for Elizabeth Regina).
'home' becomes 'nest' (I've seen this before).
'er'+'nest'='ERNEST'
Can you help me to learn more?
(Other definitions for ernest that I've seen before include "- Hemingway, US author" , "- Shackleton, Antarctic explorer" , "First name of . . . . . . Hemingway, American novelist" , "Name (of dramatic importance!)" , "fellow" .)