Norwegian port seen in December generally (6)
I believe the answer is:
bergen
'norwegian port' is the definition.
(I've seen this before)
'in december generally' is the wordplay.
'in' indicates the answer is hidden within the clue.
'BERGEN' can be found hidden inside 'december generally'.
'seen' is the link.
(Other definitions for bergen that I've seen before include "Port city of Norway" , "SW Norway port" , "Second city of Norway" , "Norwegian port city" .)