Retire to become something else (4,4)

I believe the answer is:

turn into

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'something else' is the definition.
I can't tell whether this defines the answer.

'retire to' is the wordplay.
'retire' becomes 'turn in' (turn in can mean to retire or go to bed).
'turnin'+'to'='TURN INTO'

'become' acts as a link.

Can you help me to learn more?

(Another definition for turn into that I've seen is " Become".)

I've seen this clue in The Irish Times.

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