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Pat's mate turned the old Scandinavian's spiked drink (6,4)

Ross

I believe the answer is:

mickey finn

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

'spiked drink' is the definition.
(I've seen this before)

'pat's mate turned the old scandinavian's' is the wordplay.
'pat's mate' becomes 'mick' (I can't explain this - if you can you should give a lot more credence to this answer).
'turned' shows that the letters should be reversed in order.
'the old' becomes 'ye' (resembles a historical spelling of 'the').
'scandinavian' becomes 'finn' (I've seen this before).
'ye' written backwards gives 'ey'.
'mick'+'ey'+'finn'='MICKEY FINN'

Can you help me to learn more?

(Other definitions for mickey finn that I've seen before include "spiked drink" , "knockout" , "Doped drink" .)

I've seen this clue in the Sydney Morning Herald.
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