Jester may take this Scandinavian drink with added extra (6,4)

I believe the answer is:

mickey finn

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'drink with added extra' is the definition.
'Mickey Finn' can be an answer for 'drink' (I have seen 'spiked drink' mean 'mickey finn' so perhaps 'drink' could also mean 'mickey finn'). I'm not sure about the 'with added extra' bit.

'jester may take this scandinavian' is the wordplay.
'jester' becomes 'mickey' (I can't explain this - if you can you should believe this answer much more).
'may take' means one lot of letters go next to another.
'this scandinavian' becomes 'finn' (I've seen this before).
'mickey'+'finn'='MICKEY FINN'

Can you help me to learn more?

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

I've seen this clue in The Guardian.

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