Crossword Genius

Christmas dinners have no starter for old prison officers (8)

Ross

I believe the answer is:

turnkeys

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

'officers' is the definition.
(I know this)

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for turnkeys that I've seen is " Jailers".)

I've seen this clue in The Guardian.
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