Over there in Turkey, once (3)

I believe the answer is:

yon

'over there' is the definition.
(archaic word meaning 'over there')

'in turkey once' is the wordplay.
'in' says the answer is hidden in the clue.
'YON' is hidden in the letters of 'turkey once'.

(Another definition for yon that I've seen is " Those Scots".)

I've seen this clue in the Evening Standard.

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