Big portion of Norwegian trout (5)

I believe the answer is:

giant

'big' is the definition.
(similar in meaning)

'portion of norwegian trout' is the wordplay.
'portion of' indicates a hidden word.
'GIANT' can be found hidden inside 'norwegian trout'.

(Other definitions for giant that I've seen before include "Enormous" , "Titan" , "Designating big" , "Large black and white mammal" , "Extremely tall person" .)

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

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