Crossword Genius

Old prison guard forgets new chief is from this country (6)

Ross

I believe the answer is:

turkey

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

'this country' is the definition.
(I know that Turkey is a country)

'old prison guard forgets new chief is' is the wordplay.
I cannot quite understand how this works, but
'chief' could be 'key' (I've seen this in another clue) and 'key' is located in the answer.
The remaining letters 'tur' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'from' is the link.

Can you help me to learn more?

(Other definitions for turkey that I've seen before include "Gobbling bird" , "sometimes cold" , "The bird for cranberry sauce" , "A lemon" , "one gobbles" .)

I've seen this clue in The Irish Times.
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