Scandinavian gets an extra fish (6)

I believe the answer is:

finnan

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'extra fish' is the definition.
'finnan' can be an answer for 'fish' (I've seen this before). I'm unsure of the 'extra' bit.

'scandinavian gets an' is the wordplay.
'scandinavian' becomes 'finn' (I've seen this before).
'gets' means one lot of letters go next to another.
'finn'+'an'='FINNAN'

Can you help me to learn more?

(Other definitions for finnan that I've seen before include "one smoked" , "Kind of smoked haddock" , "fish" .)

I've seen this clue in The Globe and Mail.

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