Stay with key Biblical kingdom in allegiance (8)

I believe the answer is:

liegedom

I'm a little stuck... Click here to teach me more about this clue!

'allegiance' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?

'stay with key biblical kingdom' is the wordplay.
'stay' becomes 'lie'.
'with' means one lot of letters go next to another.
'key' becomes 'g' (musical key).
'biblical kingdom' becomes 'edom' (I've seen this before).
'lie'+'g'+'edom'='LIEGEDOM'

'in' is the link.

Can you help me to learn more?

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.