Opposition politicians in Norway tucked into the cod prepared with wasabi (6,7)
I believe the answer is:
shadow cabinet
'opposition politicians' is the definition.
(I've seen this before)
'norway tucked into the cod prepared with wasabi' is the wordplay.
'norway' becomes 'n'.
'tucked into' is an insertion indicator.
'prepared with' is an anagram indicator.
'the'+'cod'='thecod'
'thecod' with its letters mixed up with 'wasabi' makes 'shadowcabiet'.
'n' placed into 'shadowcabiet' is 'SHADOW CABINET'.
'in' acts as a link.
(Other definitions for shadow cabinet that I've seen before include "Senior members of the opposition" , "Policy-making group of opposition party" , "Opposition front bench" , "leading members of the opposition" , "Top opposition members" .)